Introduction: Hemiplegia, or Yiémum in the Bamoun language, is a disease characterized by paralysis or weakness of one half of the patient's body, rendering him or her disabled. This article looks at the management of Yiémum in a context where the population believes in the supremacy of Bamoun traditional healing methods over biomedicine or conventional medicine. Objective: The aim of this article is to analyse the ethnotherapy of Yiémum (Hemiplegia) in the Bamoun cultural universe, in the West Cameroon region. Methodology: The qualitative method in Medical Anthropology was used to collect secondary and primary data in the Division of Noun over a period from 2 January to 31 August 2019. Data collected from patients, close relatives, community members, traditional healers and health professionals were analysed using the content analysis technique. Arthur Kleinman's interpretative cultural theory was used to interpret the results. Results: The causes and treatment of this condition differ depending on whether biomedicine or traditional medicine is chosen. According to biomedicine, hemiplegic patients are predisposed to sudden death linked to a stroke. This is the main cause of disability in adults. According to the second, in the Bamoun socio-culture, it is a mystical disease, or its origin is unknown. The results of the survey reveal the use of alternative medication in the care of hemiplegic patients, with ancestral practices predominating. Conclusion: There is open collaboration between conventional medical practitioners and traditional medicine initiates predestined to eradicate this disease of mystical origin. The people of the Noun division are opting more for traditional practices and biomedicine.