Welcome to HCM, Symptoms of sharp abdominal pain
below belly button can be due to a variety of causes. Depending on your age and sex , the causes could be intestinal or genitourinary or even musculoskeletal. It is important for you to get an ultrasound
abdomen, especially at the episode of pain. You must visit a general physician who will relate your symptoms with periodicity, if any and perform a proper physical exammination. Take care.