Men with prolonged hard lower abdominal pain may be caused by prostatitis, ureteral stones, cystitis and other diseases, or it may be a normal physiological phenomenon. 1. prostatitis: erection of the reproductive organs, the prostate gland continues to be congested, stimulating the epithelial tissue of the prostate gland, the prostate gland inflammation of the population, easy to cause pain in the lower abdomen. 2. Ureteral stones: when the genital organs are erect, it spreads to the surrounding organs, and there are stones in the ureter, which will cause pain in the lower abdomen and difficulty in urination. 3. Cystitis: erection of the genital organs, pressure on the surrounding tissues, the presence of inflammation or tumors in the bladder, will cause pain in the lower abdomen. 4. Normal physiological manifestations: pressure on the surrounding tissues during erection and congestion of the prostate gland can cause pain in the lower abdomen, but the pain will not be particularly intense. Causes of male prolonged hard lower abdominal pain is more reasons, may also be caused by other factors, it is recommended that the patient timely to the regular hospital hospital consultation and treatment.