Psychiatry is a medical specialty that deals with the prevention, diagnosis and treatment of mental conditions and illnesses related to emotional health, stress, sleep, behavior and mood. These disorders have a significant and often detrimental effect on an individual's emotional, cognitive, social and behavioral abilities. Examples of disorders include mood disorders like bipolar disorder and depression, eating disorders like bulimia, addiction disorders like drug and alcohol abuse. Treatment involves medication as well as psychological therapy and social intervention. Other treatments include psychotherapy to help a person change behavior and overcome problems.