Muscle cramp issue: If it is indeed a spasm "around" the belly button I am assuming it is in the muscles of the abdominla wall. And in this case it would be overuse or injury of those muscles in some way (such as too much gym work). If you mean "cramp" and it is deeper, then it is probably from muscle activity in your GI tract and the causes could be multiple.
Answered 8/31/2017
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