Background: The epidemiological data regarding the prevalence rate of mental illness among tribal population are silent in India, in spite of having the largest tribal population globally. There is limited knowledge of the actual mental morbidity among the tribal people of Manipur. The present study aims to document the patterns of psychiatric morbidity among the tribal inpatients and outpatients attending the psychiatry outpatient department in a tertiary care hospital in Manipur. Materials and Methods: A cross-sectional study design was adopted in the present study. All adult tribal patients designated/notified as a tribal by the Government of Manipur residing at least 10 years in different parts of the state attending as outpatients or inpatients in the Department of Psychiatry, RIMS, Imphal during the study period were considered the study population of the present study. A total of 240 samples were collected through consecutive sampling method. Each prospective participant was explained about the study’s objectives, interviewing protocols, and confidentiality measures. Following the participant’s consent, a self-developed semi-structured pro forma and Mini-International Neuropsychiatric Interview for adults were used for data collection. Results: The present finding undoubtedly discovered that the highest percentage of tribal patients suffering from various types of psychiatric morbidity was found to be substance-use disorder (32%), followed by generalized anxiety disorder (25%), depression (14%), schizophrenia (12%), bipolar affective disorder (10%), and psychosis NOS (7%). Regarding various types of psychiatric morbidity with respect to the gender of tribal patients, no association was found between psychosis NOS (P = 0.779) and schizophrenia (P = 0.558), whereas generalized anxiety disorder (P = 0.001), depression (P = 0.031), and bipolar affective disorder (P = 0.007) were having an association between gender. Conclusion: It was determined that the most prevalent psychiatric morbidity among Manipur’s tribal patients was substance use disorder. In addition, it was stated that 72% of them had typical common mental disorders. Female tribal patients were more likely to experience psychiatric morbidity such as anxiety, depression, and bipolar disorder, whereas male tribal patients were more likely to experience opioid dependence syndrome, alcohol dependence syndrome, and cannabis-induced psychiatric disorders. The result of the study would help improve the clinical management and successful execution of mental health treatment initiatives in areas with a predominance of tribal people.
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