Hello,

My 67 year old father has been experiencing minimal but constant stomach pain, gradual weight loss and has been having a difficult time sleeping over the last 4 months. His doctor has performed a high number of tests, including a ct scan did that did not reveal anything, blood samples and taken a stool sample. Everything has come back negative.

He started a non gluten diet 2 weeks ago and he has not experienced any change. I feel like he is detoriating.

Can you advise of something or test(s)?