The most common reason for always wanting to go to the bathroom to urinate but not much or no urine is the occurrence of acute cystitis, but there may also be diseases such as bladder stones or bladder tumors that require further examination for identification. When the bladder mucosa is congested and edematous due to acute bacterial infection, increased bladder sensitivity can occur, and a small amount of urine can cause small abdominal distension, small abdominal pain and a sense of urgency to urinate, but because there is not much urine in the bladder, the inability to urinate or only a small amount of urine each time you urinate is due to acute infection, and a clear diagnosis is needed after urine examination and anti-infection treatment before the symptoms can The symptoms can be gradually relieved or disappear. If there are irritants such as stones or tumors in the bladder, the mucous membrane of the bladder will be stimulated to produce frequent contractions, and the patient will often feel the urge to urinate, but will not be able to pass urine every time he or she urinates because of the small amount of urine. It is recommended that patients who have an obvious urge to urinate but do not urinate should undergo an ultrasound examination of the urinary system, especially in elderly patients, to rule out the presence of mucocutaneous lesions in the bladder or irritating factors such as stones.