Several things: Upper left abdomen contains spleen, tail of pancreas, splenic flexure of colon, part of stomach, left kidney, left lower ribs and muscles. Costochondritis, strained muscles, trauma to spleen, stomach ulcer or tumor, pancreatitis, problem with left lobe of liver, left kidney infection or stone, left lower lung infection, splenic flexure distention with air from irritable bowel syndrome, to name few.
Answered 7/14/2018
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