Many cuases: Too many possible causes to list. If persistent, go see your doctor. Possible sources (to name a few): gallbladder, pancreas, stomach (gastritis), lungs, etc.
Answered 9/29/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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