The causes of left lower abdominal pain in the elderly may be left ureteral stones, urinary tract infections, enteritis, intestinal tumors, and in women, it may also be caused by diseases of the fallopian tubes and ovaries. It is recommended that patients seek medical treatment as soon as possible to clarify the cause of the disease and then carry out targeted treatment. 1. Ureteral stones: patients with left-sided ureteral stones will have acute pain in the left lower abdomen, which may be accompanied by nausea, vomiting, lumbago, etc. Patients should seek medical treatment as soon as possible, and choose different lithotripsy techniques according to the location, size and shape of the stones. 2. urinary tract infection: patients with urinary tract infection will have frequent urination, urgency, pain and other symptoms in addition to the pain in the lower left abdomen, patients can choose sensitive antibiotics according to the different infectious bacteria. 3. enteritis: enteritis in the elderly may also have lower left abdominal pain, patients may also have diarrhea, it is recommended that patients seek timely medical treatment. 4. intestinal tumor: the probability of intestinal tumor in the elderly is very high, and the left side of intestinal tumor may have left lower abdominal pain when it progresses to a certain period. Generally speaking, it is recommended to have routine physical examination every year after forty years old to screen for intestinal tumors. 5. Gynecological diseases: If the elderly women have pain in the left lower abdomen, they should also suspect that it may be gynecological diseases, such as salpingitis, ovarian cysts, etc., and they should also be alert to the possibility of ectopic pregnancy. There are many causes of lower left abdominal pain in the elderly, it is recommended to go to the hospital in time, clear causes for targeted treatment.