Our expert says:
It sounds as if your doctor looked at the most obvious causes but I think one should also maybe do an examination for chronic pancreatitis (blood tests) and as a last resort do a gastroscopy as peptic ulcers may cause referred pain to the back and side. He may not have thought about this as it seems as if you live a healthy lifestyle and have no obvious risk factors, but in rare cases it can be caused by auto immune disease, high calcium levels or high lipid levels or even some medicines or an injury.
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