Anxiety may be caused by a mental condition, a physical condition, the effects of drugs, or a combination of these. The doctor's initial task is to see if your anxiety is caused by a medical condition.
Common causes of anxiety include these mental conditions:
The doctor has the often-difficult task of determining which symptoms come from which causes. For example, in a study of people with chest pain -- a sign of heart disease -- 43% were found to have a panic disorder, not a heart-related condition.