Male left lower abdominal pain for a week may be caused by left ureteral stones, colitis and prostatitis. 1. left ureteral stone: male left ureteral stone can cause left lower abdominal pain, at the same time can be accompanied by frequent urination, urinary urgency, urinary pain and other symptoms. 2. Colitis: Ulcerative colitis can cause left lower abdominal pain in men, and there may be mucus, pus and blood stools. There is a painful feeling of distension when pressed, and the site of the pain sensation will be slightly shifted. 3. Prostatitis: men present with pain in the lower abdomen and perineal area, which may radiate to the scrotum, testicles, etc., thus manifesting as vague pain in the left lower abdomen. It is recommended that the male patients with a week of pain in the lower left abdomen should go to the regular hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as to avoid delays in the condition of the body brought about by the adverse effects.