Brief Answer: Investigations as advised Detailed Answer: Hi. Your query is small but very specific too. This is a chronic problem as per your Medical History. The most probable reasons May be either of these: Pancreatic swelling Ulcer on the back part of the stomach or duodenum due to hyper-acidity Lymph node enlargement in abdomen Kidney swelling For diagnosis I would advise you the following:: Ultrasonography of the abdomen after preparation on empty stomach. Upper GI endoscopy to see the ulcers CT scan of abdomen to confirm the findings of ultrasonography. Blood tests- CBP (complete blood picture), blood sugar, urea, creatinine, amylase, lipase among other tests as may be decided by the attending Doctor. When the pain in abdomen is associated with backache, the reasons are usually the swelling of the organs which are on the back side of the abdomen and backache is due to a referred pain. Very occasionally there can be a problem in the spine that can give pain in abdomen.

---