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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.

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.

The health care provider who specializes in physical medicine and rehabilitation is called a physiatrist.

Detailed information on vascular conditions, including a description of the vascular system, causes and effects of vascular disease, and a full-color anatomical illustration.

Cluster headaches are rare and cause severe pain that tends to recur in the same way each time. Cluster headaches occur in groups, or clusters, and each attack lasts about 1 to 3 hours on average.

Appendicitis is a medical emergency that happens when your appendix becomes sore, swollen, and diseased.

Vaginal bleeding and discharge are a normal part of your menstrual cycle. If you notice anything different or unusual, talk with your health care provider.

Poliomyelitis is commonly called polio. It is an infectious disease. It is caused by 3 types of poliovirus. Polio is easily spread from person to person. The poliovirus is a virus that causes paralysis. But most people who are infected with polio have no symptoms and a few have mild symptoms.