Abdominal pain is a more common clinical symptom, and abdominal pain is mostly caused by some kind of strong stimulation or injury to intra-abdominal tissues or organs. If there is left lower abdominal pain, the first thing to consider is lesions in the abdominal organs. There are various causes of left lower abdominal pain, such as colitis (mostly vague pain or colic), which can be examined by colonoscopy, or it may be caused by strenuous exercise after meals, causing small intestine torsion, which can be done by abdominal X-ray to see if there is small intestine torsion; if there is left inguinal hernia, it can also cause left lower abdominal pain. If it is left lower abdominal pain in men, it may be left ureteritis or ureteral calculus, left spermatic varicose vein, prostatitis, etc. In this case, it is better to hold urine and have an ultrasound examination. In addition, female adnexitis or pelvic inflammatory disease, cervical erosion can also cause left abdominal pain; if an elderly person has left abdominal pain with accompanying symptoms such as anemia and weight loss, it should be taken seriously and the possibility of malignant lesions, such as stomach cancer and colon cancer, should be considered. Abdominal pain is a defense signal of the body. If left lower abdominal pain occurs, you should pay attention to your diet and avoid spicy food to prevent stimulation of the intestinal tract. If there is prolonged abdominal pain, you should go to the hospital in time.