There are several common causes of left lower abdominal pain in men in the morning: first, it may be chronic enteritis, especially chronic colitis, atopic enteritis, which often causes irritating pain in the left lower abdomen colorectum when getting up in the morning. Secondly, the pain may be caused by left ureteral urinary stones, which mainly manifest as frequent urination, urgent urination, pain in the left lower abdomen and radiating pain to the perineum, and in severe cases, accompanied by hematuria in the morning urination. Thirdly, for elderly men, the possibility of malignant tumors including colorectal occupational lesions is not excluded. Therefore, if you have left lower abdominal pain, you should go to the hospital in a timely manner, and if necessary, take a colonoscopy, CT and other examinations to find the exact cause.