There are many causes of lower left abdominal pain. Among the anorectal diseases, colitis can cause lower left abdominal pain, which is mainly characterized by chronic and recurrent lower left abdominal pain; and in patients with constipation, lower left abdominal pain can occur before defecation, which is caused by spasm of the intestine; in addition, lower left abdominal pain also needs to exclude urinary stones, and stones in the left ureter can also cause lower left abdominal pain. There are also gynecological diseases, in patients with inflammation of the left adnexa or pelvic inflammatory disease, which can also cause left lower abdominal pain. Patients with left lower abdominal pain need to go to the hospital for relevant examinations, such as urological ultrasound, uterine adnexal ultrasound, and colonoscopy. For some functional intestinal problems, if the cause of left lower abdominal pain cannot be identified through many examinations, oral probiotic drugs can be taken to improve the function of the intestinal tract.