This is Dr. David
some umbilical hernias which are nonreducable can't be pushed back in because the bowels are strangled in the hernia.
severe constipation or diarrhea or bowel infection can cause abdominal pain.
there are many diagnosis which can cause pain behind the belly button and a lump on the skin.
that is why it is important to see a doctor to get your abdomen examined
let me know if you have other questions.
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