Research indicates three possible reasons for the co-occurrence of SUDs and other mental
disorders:
1. Common risk factors for substance use disorders (SUDs) and mental disorders include genetic predisposition and environmental influences. Both can run in families, indicating certain genes may increase risk. Additionally, stress or trauma can lead to genetic changes passed down through generations, contributing to these disorders.
2. Mental disorders, including anxiety, depression, and PTSD, can lead to substance use and substance use disorders (SUDs) as individuals may self-medicate. While some drugs might provide temporary relief, they can worsen symptoms over time. Brain changes in those with mental disorders may also increase the rewarding effects of substances, encouraging continued use.
3. Substance use and substance use disorders (SUDs) can lead to other mental disorders by triggering changes in brain structure and function, increasing the likelihood of developing a mental disorder.
