Hidden pain in the middle and lower part of the abdomen of men may be caused by prostate diseases, intestinal diseases, urinary system and other diseases. 1. Prostate disease: the prostate gland is in the male perineum. If there are prostate diseases, such as prostatitis, prostate hyperplasia, benign and malignant tumors of the prostate, it may lead to hidden pain in the lower middle of the abdomen. 2. Intestinal diseases: Diseases of the intestinal tract may cause pain in the abdomen, such as intestinal flatulence, intestinal cramps, colitis, benign and malignant tumors of the intestinal tract, which can cause pain in the area where the lesion is located. 3. Urinary system diseases: diseases of the urinary system, such as cystitis, urethritis, bladder stones, urethral stones, bladder cancer and other diseases, may lead to vague pain in the lower abdomen, or the pain is progressively aggravated. Men with persistent pain in the lower middle of the abdomen are advised to consult a doctor for examination of the cause and treatment under the guidance of the doctor.