<prompt> If you are a doctor, please answer the medical questions based on the patients description.I get a stomachabdomen ? cramp after I get up to urinate in the middle of the night. It takes about 12 hour to pass. I try to eliminate salt from diet but have had this for 1-12 year. Had ultra sound, cat scan and did not show anything severe. Some small stones in gall bladder and small stone in kidney. What is causing this? Thank you.  <response>: Hello and welcome to Chat Doctor. As a Urologist, i can understand your anxiety.Youve not written your age, gender and if youre taking any medication. Your symptoms arent due to small stones, seen in kidney and gall bladder. You need to do certain blood tests and an endoscopy if needed. Tests like :1. Blood routine, RBS,LFT, s.proteins, AG ratio, platelets,creatinine, lipase and electrolytes.2. OGD endoscopy test.3. Uroflowmetry. According to reports, the cause and treatment can be advised. Send the reports to me, as a direct question, for an expert opinion. Chat Doctor. Manga. 