Individuals with somatization disorder report suffering constantly and often for many years from many physical illnesses. However, they do not have any specific, diagnosed medical illnesses that can explain their symptoms. Still, these symptoms cause distress and negatively impact their ability to function day to day.

The cause of somatization disorder is not known.

There is no medical illness to explain the symptoms, so the disorder is believed to be due to mental and emotional causes. Somatization disorder may also be due to brain processing.