### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
i have this sharp pain on the left side of my lower abdomen towards the  back. it has pained me before in 2009,2011 and now it has come again. 2009  it was on my leftside , 2011 it was on both sides. it usally comes slowly.i can start feeling it lightly likse a month before it comes fully. it hurts bad and i find it difficult to lie down. also i feel like belching but when i want to belch it hits me the more .in 2011 i was rushed to the ER and lot of tests were conducted but they were all negative. what can this be?

### output:

Hi and welcome to Chat Doctor! Thanks for posting your query here. The left lower abdominal pain in your case suggests a renal colic. Renal colic is presence of stones in the kidney pathway. You have not mentioned your age and what sort of tests conducted. The stones while passing through the passage will cause acute pain. If the diameter of the stone is less than 3 mm they will be passed out in the urine without any difficulty. If the size is more than 5 mm it causes obstruction and dilatation of the structures called HY Chat Doctor.  This can be treated by ECSWL-extracorporeal shock wave lithography or lithotomy. The feeling to belch is due to the referred pain caused by the renal colic. Sometimes this will be associated with nausea and vomiting also. An x-ray of KUB-kidney, ureter, and bladder, or an ultrasonogram of the pelvis will give you a clue of the diagnosis. Another condition acute pancreatitis could be a reason for your pain. A thorough blood check and ultrasonogram will give the exact picture. Hope this is helpful to regards