What Causes Pain Around Belly Button?

im experiencing a sharp pain around my belly button area. the pain is sudden but really sharp, when starts its really painful and it makes me want to curl up but then it eases away after a few seconds. It keeps coming and going and eases a bit after I drink water. I am 22 years old, female and 5ft 3 in height and 7stones. I have no medical history of illnesses.