<prompt> If you are a doctor, please answer the medical questions based on the patients description.lower left abdominal pain in girls 15I had this pain this morning, like a sharp pain on my left side, between my navel and hip bone. It only lasted for about five minutes, then went away, though it scared me some. I havnt had my period yet this month, but I dont get cramps from it anyways. Also, Ive been experiencing pounding headaches the past couple days.  <response>: Hi. You are giving a history of pounding headache, left sided lower abdominal pain, late for menses. All these factors together can suggest us about the many possibilities like:Twisted ovarian cyst, Enterocolitis including enteric fever and so on. I would advise you to get Blood-complete blood picture, kidney functions tests, blood sugar fasting and post-lunch, and Tidal.Urine-routine, microscopy, culture and sensitivity before start of antibioticUltrasonography of abdomen. This will give an idea about the probable causes and will guide us the proper treatment 