A man’s long-term pain in the left lower abdomen may be due to gastrointestinal dysfunction, abdominal lesions, ureteral and pelvic lesions, femoral hernia and so on. 1. Gastrointestinal dysfunction: autonomic dysfunction leads to gastrointestinal dysfunction, resulting in long-term pain in the lower left side of the abdomen, usually pay attention to diet and lifestyle habits, avoid cold food, if necessary, timely consultation. 2. Abdominal lesions: such as inflammation, Crohn’s disease, tuberculosis, adenoma of the rectum and sigmoid colon, ulcerative colitis, etc., can lead to long-term pain in the lower left abdomen of men, need to consult a doctor in time. 3. Ureteral and pelvic lesions: such as left ureteral tumors, prostatitis, cystitis, etc., if accompanied by urinary difficulties, urinary dyspareunia and other clinical manifestations, you need to go to the hospital in time. 4. femoral hernia: often related to the position, lying down after the symptoms improved significantly, sedentary or standing after the symptoms increased significantly. If you suspect that you are suffering from certain diseases, you need to go to the hospital immediately and treat the primary disease.