Liver pain is best described by the opening lines of Joseph Heller's masterpiece Catch-22:
It was love at first sight. The first time Yossarian saw the chaplain he fell madly in love with him. Yossarian was in the hospital with a pain in his liver that fell just short of being jaundice. The doctors were puzzled by the fact that it wasn't quite jaundice. If it became jaundice they could treat it. If it didn't become jaundice and went away they could discharge him. But this just being short of jaundice all the time confused them.
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