If an elderly person is unable to urinate, it is recommended to go to the hospital for an examination to identify the possible cause. In the case of elderly men, urinary retention is most often caused by prostate enlargement and requires a hospital visit for prostate-related tests. If the presence of urinary retention is diagnosed, resulting in the inability to urinate, you need to retain a catheter for drainage and be given medication to assist in the treatment of the prostate, or undergo electrodesection of the prostate enlargement to completely remove the cause in order to restore normal urination. In the case of women who are suddenly unable to urinate, neurogenic bladder, or diseases such as bladder prolapse or urethral calculi should be considered. A urinary system-related examination is recommended. If the inability to urinate is caused by obstruction of urethral stones, urethroscopic stone removal treatment is recommended. If there are diseases such as pelvic floor muscle relaxation, bladder prolapse, or neurogenic bladder, a catheter should be temporarily left in place before further treatment for the cause.