Cramps underneath my bellybutton area

hoopduck

The past three days I have been having these odd 'cramps' under my bellybutton area. They come and go infrequently, but strong enough at times to make me wince. My query is : has anyone else had these and should I be worried? They sometimes feel like they go in a straight line from my bellybutton downwards, and the first day I felt them under my diaphragm.