Background & aim: Psychiatric disorder is a disease in which patients suffer from emotional problems that these are visible in all aspect of patient’s life. So, the aim of this study was investigated the prevalence of psychiatric disorders among patients referred to Farabi Hospital in Kermanshah, 2015-16.

Methods: This was a cross-sectional descriptive-analytical study. The study population consisted of patients admitted to Farabi Hospital in Kermanshah who were admitted between March 1, 2015 and March 2015. Since the prevalence of mental illness in Kermanshah is 23.5%, with d equal to 0.05 and confidence coefficient 0.95, the sample size in this study was estimated to be 275 people. Random sampling, 275 (approximately 10% of each disorder) were selected and evaluated. The information required for each patient was recorded in a pre-prepared checklist for each patient. The distribution of each patient's epidemiological characteristics was determined according to the type of psychiatric disorders. Inclusion criteria included informed consent, patient referral in the mentioned time period and completeness of their medical records in terms of the variables studied, and exclusion criteria included lack of consent, incomplete archival records of patients referring to this time period. Data were analyzed using Chi-square test.

Results: The mean age of patients was 39.39 13 13.24 years. 98 patients (35.6%) were female and 177 (64.4%) were male. Of these, 116 (42.2%) were married and 130 (47.3%) were married. Were single and 29 (10.5%) divorced. The results showed that schizophrenia had the highest prevalence (25.8%) and delirium (1.5%) and dementia (1.8%) respectively. Also bipolar disorder was 19.3% and depression 11.3% were other common disorders. Personality disorders and schizoaffective disorders were identified as 8.4% and 7.3%, respectively, schizoaffective and Post Traumatic Stress Disorders (6.9%), respectively. Substance abuse, 4.7%, obsessive-compulsive personality, 4%, and mental retardation were 2.2%.

Conclusion: Given the prevalence of psychiatric disorders, it is recommended that public awareness be improved to better understand these disorders with the help of mass media, counseling centers, and medical sciences universities. The results of this study can also help mental health planners to design interventions related to prevention, treatment and rehabilitation of disorders. Correspondingly, by raising the level of community awareness and genetic counseling, mental retardation disorder can be largely prevented.