The vague pain under the left abdomen in men can be treated with hot compresses and massage, and some people can use medications such as mesalazine and metronidazole. The lower part of the abdomen is mainly the area of the intestines and reproductive organs, and pain in this area is mostly caused by diseases in these organs. In the event of pain, you can apply heat to the area or massage clockwise. Heat and massage can not only promote intestinal peristalsis and relieve intestinal spasm, but also promote local inflammation to subside, which has a relieving effect on minor pain. A portion of men with left lower abdominal pain is due to proctitis, and these people also have diarrhea and a feeling of urgency, which can be treated with mesalazine medication. Mesalazine is effective in the treatment of proctitis, and this drug has an inhibitory effect on the inflammation of the intestinal wall and also promotes the repair of the mucosa of the intestinal wall. A portion of people with vague pain under the abdomen is caused by bacterial infection, and can be treated with metronidazole, a common broad-spectrum antibiotic that has a therapeutic effect on bacterial infections of the digestive tract and genital organs.