There are many reasons that cause men to urinate frequently and have a distended abdomen, which may be caused by prostatitis, urinary stones, cystitis, etc. Patients can seek medical attention in time to make a clear diagnosis. 1. Prostatitis: may be caused by bacterial infection, patients often have frequent urination, urinary urgency, lower abdominal pain and discomfort, lumbosacral groin and other soreness. 2. Urinary stones: may be due to the living environment, dietary habits and other reasons, patients may have frequent urination, urinary urgency, hematuria, lower abdominal discomfort and other symptoms. 3. Cystitis: it may be caused by bacterial infection and other reasons, patients often have frequent urination, urinary urgency, urinary pain, lower abdominal discomfort and other symptoms. There may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.