Left abdominal pain should be alert to acute gastroenteritis, kidney stones, pancreatitis, gynecological inflammation, ectopic pregnancy and other diseases. 1. Acute gastroenteritis: usually caused by consuming unclean food or gastrointestinal disorder, patients will have symptoms of left abdominal pain and even nausea and vomiting. 2. Kidney stones: patients with kidney stones, if the edge of the stone is irregular, may cause urinary tract irritation and abdominal pain, and may also be accompanied by urinary tract pain and urination difficulties and other symptoms. 3. Pancreatitis: Pancreatitis abdominal pain is characterized by sudden onset, mainly after heavy drinking or overeating, sudden left abdominal pain, usually manifested as dull pain, knife pain or colic, and sometimes radiating pain. 4. Gynecological inflammation: left tubo-ovarian inflammation can cause left abdominal pain, and should be promptly consulted for a clear diagnosis. 5. Ectopic pregnancy: Ectopic pregnancy can have the manifestation of menopause, with the growth of the embryo, there can be abdominal pain. Ultrasonography can make a clear diagnosis. If the left side of the abdominal pain, it is recommended to go to the hospital in time to check the specific cause and treatment, so as not to delay the condition.