The time needed to treat urinary retention depends on the primary disease and cannot be generalized from three days to half a month. 1. Bladder distension. The bladder swells due to overfilling. The abnormal position of the enlarged bladder can press and squeeze the urethra, triggering urinary retention. This condition requires a urinary catheter to be left in place for three days, and most people can resume urination after the catheter is removed. 2. Acute prostatitis. Prostatitis can make the prostate gland congested and swollen, blocking the urethra, resulting in urinary distress and urinary retention. Generally, it is necessary to leave a urinary catheter for anti-inflammatory treatment, and remove the urinary catheter after one to two weeks. 3. Prostatic hyperplasia. This disease is most common in men over the age of 50 to 60. The enlarged, swollen prostate stretches and squeezes the urethra, making it impossible to empty the urine. Patients can take oral medications such as finasteride and tamsulosin under the guidance of a doctor and undergo indwelling urinary catheterization, with the catheter removed after one week of treatment. 4. Urinary tract infection. If the patient suffers from urinary tract infection and long-term untreated can cause urinary retention, patients need to take anti-inflammatory drugs or antibiotics under the guidance of the doctor, usually about half a month can be cured. Patients can drink more water, promote metabolism, appropriate enhancement of exercise, improve immunity. Usually pay attention to personal hygiene, wash the vulva with lukewarm water, and wash the underwear frequently.