INTRODUCTION: The purpose of the article is to present the epidemiology of suicidal thoughts and behaviours in patients admitted to the Clinic of Psychiatry at the Faculty of Health Sciences of Medical University of Warsaw. MATERIAL AND METHODS: The study included 452 patients hospitalized between April 2016 and March 2017. The authors investigated the epidemiology of suicide risk in terms of individual demographics, psychiatric diagnosis, psychopathology and substance abuse. RESULTS: The patients diagnosed with mental and behavioral disorders due to psychoactive substance use (ICD-10 F10-F19) represent 30% of the whole analysed psychiatric population and 66% of them had suicide inclinations before or during hospital admission. CONCLUSION: ...