HIV is a retrovirus that impairs the immune system and causes AIDS. Learn about symptoms and treatment.
Sexually transmitted infections are caused by bacteria, viruses, and parasites that can spread through sexual contact.
Opioid use disorder is a chronic brain disease characterized by continuing opioid use despite harmful consequences. Learn about symptoms and treatment.
Tobacco dependence treatment and research are priorities at Yale Medicine; we offer new therapies and clinical trials to help people quit smoking.
Alcohol use disorder is a chronic, recurring disorder characterized by continued alcohol use despite harmful consequences. Learn about symptoms and treatment.