What would cause abdominal popping/pulling sensation?

I'm 1 year post op (open VBG with removal of gall bladder and appendix). So far, I've lost about 120 pounds - not spectacular, but slow and steady. I've had an odd pulling/popping sensation in my lower abdomen when I lift anything over 20 pounds. It's somewhat painful, but more shocking than anything. Can anyone give me some insight as to what causes this? It's nothing like the popping/melting internal stitches I experienced right after surgery. What would a hernia feel like?

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