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A phobia is an uncontrollable, irrational, and persistent fear of a specific object, situation, or activity. The fear experienced by people with phobias can be so great that some go to extreme lengths to avoid the source of their fear.

Posttraumatic stress disorder is a debilitating anxiety that can affect people who have been through or seen a traumatic event. Counseling and medicine can help.

Bipolar disorder is a mood disorder. People with bipolar disorder switch between periods of mania and periods of depression. There is no cure, but medicine and therapy can help manage symptoms.

Dysthymia is a mild, but long-lasting form of depression. Learn more about this condition, including causes, symptoms, diagnosis, and treatment.

Bulimia is an eating disorder. It is marked by uncontrolled episodes of overeating, called bingeing. This is followed by purging with methods such as vomiting or misuse of laxatives.

A mood disorder is a mental health class. The term is used to broadly describe all types of depression and bipolar disorders.

Detailed information on the most common types of personality disorders, including paranoid personality disorder, schizoid personality disorder, schizotypal personality disorder, borderline personality disorder, antisocial personality disorder, and narcissistic personality disorder.

Schizophrenia is a complex brain disorder. It is caused by a chemical imbalance and often runs in families. This illness can't be cured. But it can be managed with medicine and therapy.

Alzheimer disease is a disease that affects the brain and nervous system. It is a type of dementia that happens when nerve cells in the brain die.