- Open Access
Health seeking behavior and use of medicinal plants among the Hamer ethnic group, South Omo zone, southwestern Ethiopia
© The Author(s). 2016
- Received: 26 March 2016
- Accepted: 24 August 2016
- Published: 6 October 2016
Health seeking behavior of people around the globe is affected by different socio-cultural and economic factors. In Ethiopia, people living in rural areas in particular, are noted for their use of medicinal plants as a major component of their health care option. This study was conducted to document ethnopharmacological information of the Hamer semi-pastoralists ethnic group in southwestern Ethiopia.
A cross-sectional study was carried out whereby information on demographic characteristics, prevalence of perceived illnesses, factors associated with preference of health care seeking options, medicinal plants used and hoarded as well as some healers’ socio-economic characteristics were collected using two sets of semi-structured questionnaires – one for household (HH) heads and the other for traditional healers supplemented by focus group discussions (FGDs). Households were selected using a cluster sampling followed by systematic sampling techniques; whereas healers and FGD participants were purposively selected with the assistance of local leaders and elders from the community.
The study revealed that the use of traditional medicine among the Hamer ethnic group is very high. Females preferred traditional medicine more than males. The main reasons for this preference include effectiveness, low cost and ease of availability. Malaria (gebeze) was the most frequently occurring illness in the area identified by all FGD participants. A total of 60 different medicinal plants were reported [34 by HH respondents, 14 by traditional healers and 12 by both]. Fifty-one medicinal plants were fully identified, 3 at generic level and 6 have not yet been identified.
It can be concluded that traditional medical practices, particularly herbal aspect, is widely used by the Hamer ethnic group, although health seeking behavior of the community is affected by different socio-economic and cultural factors.
- Ethnopharmacological information
- Cross-sectional study
- Focus group discussions
- Semi-structured questionnaires
- Hamer ethnic group
- Southwestern Ethiopia
The use of natural products as medicinal agents dates back to prehistoric period . Traditional medicine (TM) refers to health practices, approaches, knowledge and beliefs incorporating plant, animal and mineral-based medicines, spiritual therapies, manual techniques and exercises, applied singularly or in combination, to treat, diagnose, prevent illnesses or maintain well-being .
In Ethiopia, medicinal plants have been used to treat different diseases for many centuries, and religious and secular pharmacopoeias had been compiled since the 15th century, resulting in medical pluralism [3, 4]. The studies of the tribal indigenous knowledge of plants and their local use is often linked to purpose-specific characteristics of plants, mainly, their efficacy to correct harmful symptoms or eliminate causal factors associated with particular conditions constituting an important but preliminary aspect of ethnopharmacological research .
Comparing the existence of the variety of cultures and diversity of climatic conditions, the documentation of ethnomedical use of plants is limited in Ethiopia . Furthermore, most of the sources for these documentations focused only on the herbalists and the Ethiopian medico-religious manuscripts without giving due attention to the rich traditional knowledge and practices of ordinary people . This trend might hinder access to the traditional knowledge preserved by grassroots; affecting the scope and quality of the documentation and the research on medicinal plants . This is particularly true among pastoralist communities of Ethiopia where access to biomedical practitioners is limited. Thus, the purpose of this study is to assess and document traditional medicinal plants knowledge and uses among the Hamer ethnic group in South Omo zone, Southwestern Ethiopia.
Study area and socio-economic settings
Hamer woreda is one of the nine woredas (second from lowest administrative units in government structure) in South Omo Zone, Southern Nations, Nationalities and Peoples Region (SNNPR), with an estimated area of 731,565 hectares. It is located at 770 km to the southwest of Addis Ababa or 540 km from Hawassa, the capital of SNNPR. It is bordered by Bena-Tsemay to the north, Kenya-Kuraz-Borena of Oromia to the south, by Bena-Tsemay and of Borena of Oromia to the east and Kuraz woreda to the west . Dimeka is the capital of Hamer woreda. The total population of the woreda is 59,160 (29,466 female and 29,694 male). Eighty percent of the population belongs to the Hamer ethnic group; 11.2 % to the Erbore ethnic group; and 2.47 % to the Kara ethnic group. A total of 3210 people live in Dimeka and the neighboring Turmi towns and the remaining 55,950 live in rural areas . At the time of this survey, the woreda had three health centers and eight health posts. Harmful traditional practices and low coverage of health services resulted in low health status of the population in the woreda [8, 9].
Sampling, data collection and analysis
Ethical approval was secured from the Institutional Ethics Review Board of the School of Pharmacy, Addis Ababa University, prior to starting of the study. Information on demographic characteristics, prevalence of perceived illnesses, factors associated with preference of health care seeking options, medicinal plants used and hoarded as well as some healers’ socio-economic characteristics were collected using two sets of semi-structured questionnaires – one for household (HH) heads and the other for traditional healers (Additional file 1) .
Eight key informant traditional healers were selected purposively based on their healing experiences as testified by community leaders, kebele administrators and community elders (Additional file 1). Focus group discussions (FGDs) were held in each selected kebele whereby each FGD group consisted of seven members selected from elders of the community whose ages ranged from 40 to 70 years.
Data collectors, who were high school students with good knowledge of the local and English languages, were given training for two days on the data collection instruments. Oral consent was obtained from each respondent before conducting the interview. Moreover, participants of the study have consented to their photograph being taken for publication, if necessary. Variables like socio-demographic characteristics of HH respondents, HH size, existence of illness during the 2 weeks preceding interview date, choice of treatment options, names and parts of plants used, etc. were entered in Statistical Package for the Social Sciences (SPSS) and analyzed. The qualitative data was analyzed thematically.
Summary of FGDs
The FGDs were held in the following eight kebeles of the woreda: Ariya Kayusa, Achi Musa, Besheda, Shanko Kelema, Gediback, Asele, Lala and Degakeja Algan. Age of the participants ranged from 40 to 70 years (27 females and 29 males). The results of the FGDs were summarized by giving the local names of illnesses in italics. Major signs and symptoms or closer meanings of the illnesses are shown in Additional file 1.
Malaria (gebeze) was the most frequently occurring illness in the area identified by all FGD participants. In addition, eye diseases (afo burka), diarrhoea (zen), tinea infections (berdate), common cold (gulfadhana), evil eye (chaqi), jaundice (ara), skin disorders (bishi/shelofecha), snake bite (guni) and hypertension (lognagena) were identified as common illnesses that threaten the community.
In contrast, five participants from three different kebeles argued that modern medicine is their first choice if and when they seek medical care. They stated that health institutions deliver health care service following proper and evidence-based diagnosis better than traditional healers. Two participants from Lala kebele suggested that homemade remedies should be tried and their effectiveness proven before using them for medication.
According to the majority of FGD participants, plants are the major sources of TM among the Hamer ethnic group. Even though they were not keen to give details of these medicinal plants, they reported that they use a large number of plants to treat a variety of diseases. They underlined that the names and other details of these medicinal plants should only be disclosed to “special” persons. However, one of the participants explained that collecting medicinal plants on the basis of their colour was a very common pattern. For instance, plants such as fulante (Dichrostachys cinerea (L.) Wight & Arn.) and guci (Lagenaria siceraria (Monila) Standl.), which have pale yellow flowers are used for the treatment of jaundice (ara). It was observed that no special attention is given to plants with medicinal values and that they are treated just like any other plant. According to the participants, the main reason for this may be associated with the fact that pastoralists are usually on the move and are, therefore, unable to grow or cultivate plants on a regular basis. The majority of medicinal plants are collected from the wild. In addition to plants, animals and minerals are also used as a source of medicine for TM. Examples of such animal products include goat meat (Qoli), fats, milk and blood of goat and cow, and bone of goat.
The majority of the FGD participants claimed that knowledge of traditional medicines, particularly herbal medicine, is handed down from elders to younger generation through word of mouth. Among the Hamer ethnic group, traditional knowledge is transmitted only to the eldest son or a male member from close relatives. Otherwise, knowledge and skill of healing are held always in secret. Although the participants were aware of the menace of this type of transferring traditional knowledge and practice, they still believe that it should continue to preserve the dignity of their ancestors. In the case of knowledge transfer of Merankal, which is associated with divine power, the practitioners carry out rituals where their spirits tell them as to who should be their successor and ask their spirit to transfer their spiritual power to their successor. There were two FGD participants from Lala kebele with different views. According to them, healers are selected by nature and god (Burjo) to keep the well-being of their community.
Nearly all participants from Ariya Kayusa, Achi Musa, Besheda and Shanko Kelema kebeles expressed that young members of their community have much less interest in traditional medicine. Improved physical access to modern health institutions, the effect of modernization that comes through expansion of modern education and the Christian religion were mentioned by participants as the main reasons for such decline in interest by the younger generation.
A total of 8 respondents (seven males and one female) who belong to members of traditional healers of the community were interviewed. Five of the healers were nonliterate, and only three of the healers had received formal education.
Illnesses treated, methods of diagnosis and sources of medicine
Illnesses and symptoms reported to be treated by traditional healers of the Hamer ethnic group, South Omo Zone (January–February 2010)
Silito (tuberculosis), gebez (malaria), zen (diarrhoea), fever, tinea, ara (jaundice), berdate (intestinal worms), astiajim (toothache), gulfadhana (common cold), dysentery, sal (cough), wounds, tonsillitis
Lognagena (blood pressure), chaki (evil eye), guni (snake bite), asthma, male sexual impotence, muscle pain, pain associated with menstrual cycle, meta ajim (migraine), nature spirits, curses, fractures
Mode of service delivery
The present survey indicated that all of the healers provide their medical services on part-time basis. The majority of these practitioners had healing experience of less than 20 years. While delivering their services, nearly all of the traditional healers reported that they had a single assistant except for one practitioner who said that he had three assistants. Assistants are mostly healers’ own sons or male close relatives. None of the interviewed healers set costs for their service. They charge their customers after assessing their livelihood, and also on the basis of their relationship to the healer.
Perceived illnesses and action taken during the 2 weeks recall period
Actions taken against perceived illnesses during a 2 week recall period among the Hamer ethnic group, South Omo Zone (January-February 2010)
Action taken N (%)
Went to health institutions
Went to traditional healers
Took homemade remedies
Took no action
Factors influencing actions taken and preferred health care options
Choices of healthcare options with respect to socio-demographic characteristics of household (HH) respondents among members of the Hamer ethnic group, South Omo Zone (January–February 2010)
Choice of health care N (%)
The effect of age on action taken against perceived illnesses during the 2 weeks recall period was found to be significant (χ 2 = 170.485, df = 2, P < 0.0.05). Accordingly, the proportion of children for whom action was taken against perceived illnesses during the 2 weeks recall period was higher as compared to those with age above 15 years.
In terms of preference to choice of health care options, the percentage of those HH respondents who favored biomedical care in case of illness increased from 31.5 to 54.7 % with low and high income respondents, respectively. Likewise, those who chose TM as a first line option declined from 68.4 to 45.3 % in these groups. The effect of economic status on the choice of health care options of HH respondents was found to be statistically significant (χ 2 = 40.347, df = 2, P < 0.05). The influence of education on choice of treatment options of HH respondents was also statistically significant (χ 2 = 7.210, df = 1, P < 0.05). In this regard, literates (41.5 %) prefer biomedical care to TM as a choice of health care more than nonliterates (34.9 %) (Table 3).
Plants reported to be in use
A total of 60 different medicinal plants were reported [34 by HH respondent, 14 by traditional healers and 12 by both]. Fifty-one (85 %) medicinal plants were fully identified, 3 (5 %) were identified at generic level and 6 (10 %) have not yet been identified.
Commonly treated illnesses with herbal remedies in household (HH) and by traditional healers among the Hamer ethnic group (January–February 2010)
Skin allergies (143), wounds (154), snake/scorpion bites (419), dandruffs (85), eczema (73), burns (112), tumors of skin/abscess (98), fungal skin infection (44), tinea capitis (162), skin rash (itching) (41)
Abdominal and GIT problems
Diarrhoea (178), abdominal colic (267), abdominal discomfort (141)
Respiratory tract problems
Common cold (218), dry cough (123)
Malaria (518), intestinal helminths (432)
ENT (Eye, nose and throat)
Eye diseases (274), toothache (463), tonsillitis (116)
Evil eye (303), muscle and joint pain (121), headache (118), loss of appetite (1), dysmenorrhoea (1), irregular menses (1)
Medicinal plants reported by household (HH) respondents of the Hamer ethnic group, South Omo Zone (January–February 2010)
Scientific name (Collection number)
Method of preparation and use
Barleria eranthemoides R. Br. ex C. B. Clarke (H022)
Pounded, boiled with water, filtered and drunk
Rhus natalensis KraussN (H040)
Various disease of stomach
Macerated in water, filtered, mixed with honey, and drunk
Malodor of mouth
Gently chewed for about an hour
Launaea intybacea (Jacq.) Beauv.N (H046)
Ground, macerated in water, and the filtrate applied on the affected area
Balanites aegyptiaca (L.) Del.N (H025)
Inside part of the bark peeled off, boiled with water, filtered and drunk
Boswellia neglecta S. MooreN (H044)
Dried, burned and the smoke inhaled
Opuntia ficus-indica (L.) Miller (H059)
Sliced and rubbed against the affected part of the scalp
Combretum aculeatum VentN (H034)
Fresh leaves chewed, and juice swallowed
Treminalia brownii Fresen.N (H038)
Jaundice for both human and animals
Inner bark peeled, chopped, macerated in water, filtered and drunk
Commelina benghalensis L. (H054)
Applied on the affected area
Lagenaria siceraria (Monila) Standl. (H060)
Fruit dissected and patient’s face covered with the inside part of the dissected fruit
Cyperus alternifolius LN (H055)
Chopped, chewed, and juice swallowed
Sansevieria ehrenbergii Schweinf. ex Baker N (H018)
Fresh leaves pounded, and juice applied on wound
Fresh root chopped, boiled in water, filtered and drunk
Sansevieria forskaoliana (Schult.f.) Hepper & Wood (H020)
Blister after burning
Fresh leaves smashed, juice applied on the site of burning
Euphorbia sp. (H027)
Fresh bark chopped, macerated in water, filtered, mixed with honey and drunk
Acacia tortilis (Forssk.) Hayne (H043)
Goat intestinal parasite
Fresh leaves fed to goats
Albizia anthelmintica (A.Rich.) Brogn. (H009)
Inside part of the fresh bark cut, boiled with water, filtered, mixed with sorghum powder and eaten
Indigofera sp. (H036)
Chewed and juice swallowed
Ormocarpum trichocarpum (Taub.) Engl. (H031)
Chopped, macerated in water and applied on swollen skin
Senna italica Mill.N (H017)
Allergy on skin
Fresh leaves crushed, stood in cold water and filtrate drunk
Ocimum lamiifolium Hochst. ex Benth.N (H050)
Crashed and rubbed on affected area
Plectaranthus sp. (H037)
Leaves or roots chopped, boiled with water and decoction drunk
Sida rhombifolia L.N (H048)
Fresh aerial part ground, macerated in water, and filtrate drunk
Cissampelos pariera L. (H023)
Fresh leaves squeezed on wound
Rhamnus prinoides L’Herit N (H058)
Macerated in water and the swollen fruit rubbed against the affected skin
Canthium pseudosetiflorum Bridson (H032)
Ground, macerated with water, filtered and drunk
Vepris glomerata (F. Hoffm.) Engl.N (H029)
Malaria, abdominal colic
Fresh leaves or mixed with bark cut into pieces, stood in water, filtered and drunk
Zanthoxylum chalybeum Engl. N (H026)
Dried fruits roasted, chewed and swallowed
Salvadora persica L.N (H028)
Root or stem chewed, and juice kept in the mouth
Datura stramonium L. (H042)
Fresh leaves chopped, squashed, and juice applied on scalp
Solanum dasyphyllum Schumach.N (H049)
Chopped, chewed, and swallowed
Withania somnifera (L) Dunal N (H021)
Common cold, tonsillitis
Fresh roots chewed and juice swallowed
Grewia villosa WilldN (H039)
Chewed and swallowed
Medicinal plants reported by traditional healers among the Hamer ethnic group (January–February 2010)
Method(s) of preparation
Hypoestes forskaolii (Vahl) R.Br. (H052)
Fresh roots ground, macerated in water, filtered and drunk
Amaranthus hybridus L. (H053)
Powdered, cooked in water and drunk with honey
Amaranthus spinosus L. (H045)
Crushed, and pressed on tooth
Cadaba farinosa Forssk.N (H024)
Chopped, boiled with meat soup and drunk
Chopped, boiled with meat soup and drunk
Maerua triphylla A. Rich (H011)
Irregular menstruation, loss of appetite
Crushed, stood in water, filtered, and drunk
Cucurbita pepo L (H035)
Dried, roasted, chewed and swallowed
Zehneria pallidinervia (Harms) C. Jeffery (H014)
Cattle eye disease
Fresh leaves crushed, and juice instilled into the affected eye
Cyperus distans L.f. (H004)
Roots or mixed with inner bark, chopped, macerated in water, mixed with milk and drunk
Dichrostachys cinerea (L.) Wight &Arn.N (H010)
Inner part peeled off, chopped, boiled with water smoke is inhaled
Leucaena leucocephala (Lam.) De Wit (H013)
Hypertension, intestinal parasite, irregular menstruation, loss of appetite
Chopped, macerated, filtered, mixed with honey and milk, and drunk
Chasmanthera dependens Hoscht. (H041)
Fresh leaves chopped, smashed, and pressed on tooth
Chopped, macerated in water, filtered and drunk
Crushed, infusion prepared, filtered, mixed with milk and drunk
Burnt, and smoke inhaled
Chopped, boiled in water and vapor inhaled
Fed to goats
Medicinal plants reported by traditional healers and HH respondents of the Hamer ethnic group, South Omo Zone (January–February 2010)
Scientific name (Collection number)
Method (s) of preparation
Aloe otallensis BakerN (H002)
Mixed with honey and milk, and drunk
Applied on wound
Ozoroa insignis Del. (H005)
Inner part peeled off, chopped, macerated in water, filtered and drunk
Adenium obesum (Forssk.) Roem. & Schult.N (H003)
Chopped, chewed and juice swallowed
Chopped, boiled in water, cooled and drunk
Carissa spinarum L (H016)
Crushed, infusion prepared in water, filtered, and drunk
Lepidium sativum L. (H056)
Allergic reaction on skin, ulcer in mouth and throat
Ground, mixed with butter, applied on the skin, mouth and throat
Cadaba mirabilis Gilg. (H030)
Crushed and juice instilled into the affected eye
Maytenus senegalensis (Lam.) Excell (H047)
Chopped, boiled in water and vapor inhaled
Euphorbia tirucalli L.N (H033)
Fresh juice applied on wound
Moringa stenopetala (Bak. f) Cuf.N (H051)
Fresh leaves boiled, allowed to cool, and the filtrate drunk
Fresh leaves or roots or both boiled, allowed to cool, filtered, mixed with honey and drunk
Datura metel L. (H007)
Fresh leaves squashed and juice applied on the affected area
Solanum incanum L.N (H001)
Ripen fruit squeezed on wounds
Chewed and juice swallowed
Fresh leaves chopped, squashed, and juice applied on the affected area
Among the collected plants, 68.9 % were from forests or wild sources and 13.1 % were cultivated or garden plants, and 18 % were obtained from both forests and gardens. The most widely used preparation methods include maceration, decoction and infusion. The majority of the preparations are simple recipes (using only one plant as ingredient), while one of the preparations contained mixture of plants.
The findings of this study indicated that the majority of the healers are males. Although the number of key informants in this survey was small, similar trends were found in previous surveys [10–14]. This higher number of male traditional healers than females in traditional healing practice might be due to the tradition of the healing practice that does not encourage women to be involved in. The majority of the plants used to treat diseases are collected from the wild. Thus, considering the time and effort required to collect these materials together with other socio-cultural factors such as transfer of knowledge from elders to male members of the family in secret, discourage women to be actively involved in the practice of traditional medicine [10, 13].
According to the traditional healers, visual observation and history taking were the two main methods of diagnosis. Spiritualism could also be employed whenever the patient condition is non-natural causes which could not be diagnosed by physical assessment and history taking. The sources for healing constitute different components of traditional medical practices. The results of the present survey indicated that the majority of healers used plant and animal products to treat illnesses, while two of them used animal products combined with spiritual power, and only one used spiritual power to treat illnesses. In addition to these, some traditional healers perform minor surgeries.
In agreement with the present study, other similar studies indicated that many traditional healers practice on a part-time basis but that they have a long experience in the profession [10, 11, 15]. It has been observed that long experience is needed for traditional medicine practitioners (TMPs) to be effective .
Similar to the results obtained from elsewhere , traditional healers in the Hamer ethnic group reported that they use their sons or male close relatives as an assistant. In most cases the responsibilities of the assistants were limited to preparing equipment and materials required for treatment of patients. In addition, they help weak clients who are unable to take care of themselves. In some cases when the healer is too old, they carry out his duties as per his instructions and under his supervision.
None of the interviewed healers had fixed payment rate for their services. The rate is determined on the basis of customer’s economic condition and relation to healers. A previous survey carried out in other parts of Ethiopia also documented a similar finding .
Concurrent with the report generated from other studies [16, 17], the present study indicates that a high proportion (64.2 %) of HH respondents reported to have sought help from TMPs. The Hamer ethnic group largely tended to seek help from TMPs for the following reasons; firstly, they are nomads/pastoralists and therefore move from one place to another following the track of their cattle. Secondly, the majority of community members live in poverty and poor infrastructure. Thirdly, the cost of traditional medicine is very low compared to modern drugs and this is compounded with the cultural beliefs of the community that only traditional medicine is effective in combating certain types of illnesses such as evil eye (chaki), snake bite (guni) and hypertension (lognagena). In addition, factors such as lack of information and community members’ desire for health services that are readily available, affordable and socially and culturally acceptable, play a decisive role for their choice . Hence, TM remains the mainstay in narrowing the gap of their health care needs [17, 19, 20]. These results obtained from HH respondents concur with the findings of FGDs.
Patterns of health service utilization and health care seeking were found to be influenced by socio-economic status, level of education, cultural beliefs and perceptions of the causes of diseases and scope for treating different conditions [18, 19, 21]. In this study females (69 %) sought more help from TMPs than males (61.1 %) for their health care. These results are in agreement with a previous study carried out in Ethiopia  but different from surveys conducted in other countries [19, 22, 23]. This might be due to the enormous burden on females in the Hamer ethnic group to look after the family; long distances form health institutions and poor infrastructure, low income status and the cultural beliefs of the community [18, 24, 25].
The influence of education on choice of treatment options of HH respondents was statistically significant (χ 2 = 7.210, df = 1, P < 0.05). For that reason, literates (41.5 %) prefer health care facilities to TM as a choice of health care more than nonliterates (34.9 %). Thus, the present survey clearly showed that income status and educational status of HH respondents could influence the choice and quality of health care needs and actions taken against perceived illnesses. Respondents with higher economic status and literates sought modern health care services more than those with lower economic status and nonliterates (P < 0.05). Similar trends have been demonstrated in previous studies [17, 19, 26]. The findings appear to indicate that people with lower socio-economic status might have problems of access to modern health care facilities as they may not afford the cost , and/or lack of education could also impinge on the awareness of the community members about the ailments and seeking help for health care [18, 19].
In terms of preference to choice of health care options, the percentage of those HH respondents who favored health institutions in seeking medical care when a family member gets sick rose from 31.5 to 54.7 % from low income respondents to high income respondents. Likewise, those who chose TM as a first line declined from 68.4 to 45.3 % in these groups. The effect of economic status on the choice of health care options of HH respondents was found to be statistically significant (χ 2 = 40.347, df = 2, P < 0.05).
Of the collected and identified medicinal plants, Fabaceae is the most commonly reported family, which is in agreement with other surveys carried out in different parts of the country . This is not surprising as Fabaceae is the second largest family in the country behind Asteraceae, in addition to being among the most common families found in dry forests . In this study, a large number of medicinal plants are collected from the wild, a finding similar with surveys conducted in other parts of Ethiopia [26, 28], Kenya , Ghana , Brazil , Serbia , and Malaysia . However, at least in one survey conducted in Northern Ethiopia , the majority of medicinal plants are collected from gardens. In general, collection of medicinal plants from forests indicates that there is little practice of preserving medicinal plants in cultivated areas or home gardens. In the context of the current survey, the reason could be associated with the life style of the community, who are by and large pastoralists. This, together with poor protection of wild medicinal plants due to the ongoing mass destruction of wild vegetation for different purposes by the community and overgrazing are endangering medicinal plants and discourage the practice of traditional health care in the study area [15, 20, 28].
The main reasons for the most common use of leaves and roots could be due to the fact that they act as reservoirs for exudates/secretions which are believed to contain toxins, some of which may have medicinal value, and also due to the relative ease of finding these plant parts [34, 35]. The popularity of roots as a source of herbal drugs has serious consequences from both ecological point of view and the survival of the medicinal plant species . Therefore, due attention must be given to this problem before the situation gets worse.
The majority of the preparations are simple recipes (using only one plant as ingredient), while one of the preparations contained a mixture of plants. The use of simple recipes has been reported in other parts of the world [30, 37]. The combination of more than one plant in herbal preparations could increase the potency mainly due to synergistic or additive effect. Whilst the majority of the remedies were prepared form freshly collected plant parts, dried parts are also used to prepare very few plant drugs, a finding that was consistent with other works conducted in Ethiopia [20, 38], India  and Brazil . The possible justification for the use of fresh plant material could be due to the simplicity of the method which does not require sophisticated equipments.
The present study revealed that health seeking behavior of the Hamer ethnic group is affected by different socio-economic and cultural factors. There is also a strong indication for traditional medical practices and use of plant materials to treat various ailments and health problems among the study population. Selection of medicinal plants by the Hamer ethnic group appears to have sound basis as most community members claim to have benefited from the use of herbal drugs. The study also showed that the majority of medicinal plants are collected from the wild; with leaves and roots being the most widely used plant parts. Collection of leaves from wild may not pose a serious danger to the survival of a plant. However, collection of roots may contribute to the destruction of the plant species causing high risk of loss of biodiversity. The use of medicinal plants in particular, and traditional medicine in general, among the study population is facing danger of survival as the means of transferring knowledge form one generation to another is mainly by word of mouth, and the younger generation appears to have no interest in acquiring such knowledge. Therefore, it is important that the government creates awareness among community members about the significance of preserving traditional knowledge and also conserving medicinal plants before they disappear. Furthermore, additional surveys on other minority ethnic groups of the woreda should be conducted in order to collect, identify and document medicinal plants and other traditional medical practices.
Our appreciation goes to the people and traditional healers of Hamer Woreda for their participation in the study. One of the authors (B.P.) would like to acknowledge the Graduate Studies and Research Office of Addis Ababa University for sponsoring this research work which is part of an M. Sc. study. The authors would also like to thank Mr. Melaku Wondafrash, the National Herbarium, Department of Biology, Addis Ababa University for identification of plant material.
BP is grateful to the Graduate Studies and Research Office of Addis Ababa University for sponsoring his MSc study.
Availability of data and material
BP coordinated data collection; performed data entry and analysis and wrote the draft manuscript. TGF, KA and DB initiated the idea, involved in the design of the study, developed data collection instruments and corrected the manuscript. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Oral consent was obtained from each respondent before conducting the interview. Moreover, participants of the study have consented to their photograph being taken for publication, if necessary.
Ethics approval and consent to participate
Ethical approval was secured from the Institutional Ethics Review Board of the School of Pharmacy, Addis Ababa University, prior to starting of the study.
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