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.
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.