Men’s left abdominal pain on pressure may be due to left ureteral stones, intestinal lesions, inguinal hernia, prostatitis and other causes. 1. Left ureteral stone: Due to ureteral stone, the urinary tract is blocked and the pressure of the renal pelvis is elevated, thus causing symptoms such as left-sided abdominal pain. 2. Intestinal lesions: patients suffering from ulcerative colitis, intestinal obstruction and other diseases, the intestinal mucous membrane layer is destroyed, thus appearing in men with left abdominal pressure pain, abdominal distension, mucous blood stool and other symptoms. 3. Inguinal hernia: when men stand or press the left side of the abdomen, an oval or pear-shaped lump will appear in the groin. Men can involve to the scrotum, patients appear abdominal pain, left abdominal pressure pain symptoms. 4. Prostatitis: Patients suffering from prostatitis will show symptoms such as discomfort in the pubic area, urinary urgency, frequent urination, urinary pain, and pain on the left side of the abdomen when pressed. If there are other diseases such as gastritis, gastric ulcer and other diseases, due to the lesion of gastric mucosa, there may be epigastric discomfort, nausea, left abdominal pressure pain. Patients should go to the hospital in time, clarify the cause of the disease and follow the doctor’s instructions for treatment.