Your doctor will ask about your symptoms and will examine you. Your doctor may press on muscles in your chest to see if the pressure triggers a spasm of pain. Often, your doctor can diagnose the problem without any special tests, especially if there is an outbreak of the illness in your area.
If your doctor is not sure of the diagnosis, you may need additional tests. These may include blood tests, X-rays of the chest or abdomen, an electrocardiogram (EKG) and a laboratory examination of body fluids or feces.