Causes of constipation pain in the lower left abdomen include: 1. Anal blockage caused by dry stools, or poor opening of the anus caused by the accumulation of hemorrhoids, causing intestinal peristalsis intestinal spasm. The solution is to unblock the anus and open the venting function of the anus to reduce the patient’s pain. Most of these patients suffer from prolapse of the rectal mucosa, or severe mixed hemorrhoids, which can be treated surgically; 2. Spasm or hypertrophy of the puborectalis muscle, causing pulling pain in the left lower abdomen, patients can be treated surgically.