Unsure: Swelling of the flank can be looseness of the muscles, inflammation of the muscles, distention of the left colon (large intestine) with stool and gas (most likely scenario). Or a tumor (which is unlikely to go away!). Hernias are rare in the flank. I would suspect a buildup of gas and stool; you may benefit from a fiber supplement like benefiber or a laxative like miralax (polyethylene glycol). Good luck!
Answered 10/3/2013
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