Sudden inability to urinate may be caused by prostate hyperplasia, urinary tract infections, urinary stones and other diseases, which can be improved by medication, surgery and other ways. 1. Prostatic hyperplasia: If prostatic hyperplasia causes sudden inability to urinate, the patient can first stay catheterized, and then follow the doctor’s instructions to take terazosin, doxazosin and other alpha-blockers to have 5 alpha-reductase inhibitors, such as finasteride and so on. Patients can also improve their symptoms by prostate electrocision or removal. 2. Urinary tract infections: such as prostatitis, urethritis, etc., can also be manifested as urinary difficulties, sudden inability to urinate, the patient can follow the doctor’s instructions to take antibiotic drugs such as cefadroxil, cefdinir, etc., to promote recovery. Can be difficult to urinate seriously, there is urinary retention, usually also need to stay catheterization for relief. 3. Urinary stones: sudden inability to urinate may also be caused by urinary stones, such as bladder stones or urethral stones, generally based on surgical treatment. Patients can be crushed by intracavitary lithotripsy, and then the stones will be discharged through the urine. If there is a sudden inability to urinate, it is recommended to go to the regular hospital to consult the examination, to clarify the cause of the disease, under the guidance of the doctor for treatment.