Hello, Pain in the upper left quadrant of abdomen may be because of acute or chronic pancreatitis, gastroesophageal reflux disease, enlarged spleen, irritable bowel syndrome, pleurisy, costochondritis, collapsed lung, acute gastritis, or peptic ulcer. Treatment depends upon the cause of pain. You need to be examined thoroughly and investigations may be necessary like ultrasonography of abdomen and pelvis, chest X-ray and complete blood picture. To arrive at a specific diagnosis and initiate appropriate treatment, you need to consult a general surgeon as soon as possible. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Pallavi M., Anesthesiologist