Human: What are the causes of teenage depression? Assistant: 
The main causes of teenage depression include family difficulties, such as an unstable home life or the death of a loved one; environmental factors, such as bullying or abuse; poor lifestyle choices, such as lack of sleep, unhealthy eating habits, and excessive alcohol and drug use; and other mental health disorders, such as anxiety. Other potential causes of teenage depression include hormonal changes, difficult transitions, certain medications, and certain medical conditions.