Some people have excessive and unrealistic worries about their health. They are very worried about getting a disease or are certain they have a disease, even after medical tests show they do not. And these people often misinterpret minor health problems or normal body functions as symptoms of a serious disease. An example is a person who is sure that her headaches are caused by a brain tumor. This condition used to be called hypochondria. Now it is called somatic symptom disorder. The symptoms associated with somatic symptom disorder are not under the person's voluntary control, and they can cause great distress and can interfere with a person's life.

Somatic symptom disorder can happen at any time of life, but most often begins in early adulthood. It affects men and women equally.