A 48-year old man presented with low back pain of unknown cause. He works as a carpenter and says he is very active, has work-related mishaps (accidents and falls), and engages in repetitive motions of all kinds using his arms, back, and legs. The pain is intense when he has it, but it seems to come and go. He is not sure if eating makes the pain better or worse. He has lost his appetite because of the pain. After conducting an examination including a screening exam, the clinical presentation does not match the expected pattern for a musculoskeletal or neuromuscular problem. You refer him to a physician for medical testing. You find out later he had pancreatitis.
What is the most likely explanation for this pain pattern?
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