The pain in the lower left side of a man’s stomach is often caused by the following reasons: 1, urinary tract infection combined with urinary stones, need to go to the hospital to check the urinary tract ultrasound and urinary routine, etc. for clarification. If the disease, you need to actively drink more water, at the same time appropriate bouncing, some patients need to lithotripsy or surgery; 2, may be caused by excessive accumulation of stool, when the sigmoid colon has too much stool, it can cause pain in the lower left side, usually after defecation pain can be gradually relieved; 3, may be caused by inguinal hernia, in the left lower abdomen can appear pain, accompanied by the formation of a mass, you can go to the The pain may be caused by inguinal hernia, which can occur in the left lower abdomen, accompanied by mass formation, and can be clarified by going to the hospital for physical examination and abdominal ultrasound; 4.It cannot be excluded that it is caused by varicocele, which can be clarified by ultrasound; 5.Some patients have pain caused by abdominal wall muscle injury, or even intestinal malignant tumor.