<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have sharp stabbing pain in my upper left abdomen. It started Sunday night, I was uncomfortable no matter how I laid in bed Sunday night but the best was to lay on left side on a heating pad. Yesterday during day the pain was not nearly as bad while I was working but started up again after I ate dinner and has not ceased since.  <response>: Hello dear , welcome to Chat Doctor.come have evaluated your query thoroughly. There are different possibilities for this pain in left upper abdomen as Abdominal wall related as muscular. Intro abdominal left Hyperion Chat Doctor. Diaphragm related. Left lung lower lobe pathology as pneumonia, effusion or other. Referred from kidney as calculus or other. Hope this will help you for sure. Wishing you fine recovery. Regards dear take care. 