Objective. To determine the frequency of mental health disorders and their relationship with socio-demographic variables and consumption of alcohol and tobacco in adults seen at the Mental Health Care Unit “San Agustín” in Tuxtla Gutiérrez, Chiapas, during the period 2012-2018. Method. Cross-sectional study that included 4612 adults within a range of 18-60 years old attended at Unit’s outpatient service during the above mentioned period. Results. Fifty percent of the total of probands were women, 60% within a range of 18-39 years old. The most frequent disorders were schizophrenia (31.2%), mood (24.1%), and anxiety (21.9%). Variables such as age, sex, family history, and alcohol and illicit drug use were associated with the presence of the most frequent disorders. Similarly, mood disorders presented a higher prevalence among young people and women. Conclusion. The trend rega...