Urination can not come out for a day to consider and drink less water, mental tension and other physiological factors, but also consider and urethral stenosis, urethral stones, prostate hyperplasia and other diseases. 1. Physiological factors: a day of drinking less water or no water, mental stress or in a state of excessive busyness, may appear for a long time according to the phenomenon of urinary discharge. 2. Urethral stenosis: Urethral stenosis is related to trauma, medical injury and infection. When the patient urethral stenosis, there may be a day of urination can not come out phenomenon. Some patients are also prone to dribbling and thinning of the urine line. 3. Urethral calculi: Urethral calculi can cause some patients to appear a day without urination phenomenon, but also easy to accompany the thin urine stream, urinary incontinence, urinary pain and other symptoms. Generally, urethral stones are related to metabolic abnormalities and urethral stenosis. 4. Prostatic hyperplasia: the etiology is not clear, may be related to sex hormones and their receptors, inflammation and infection. Patients in the urination period may appear waiting for urination, urinary line bifurcation, difficulty in urination, urinary dribbling and other symptoms, can also be manifested as urination can not come out for a day. It is recommended that patients who are unable to urinate for a long period of time should consult a doctor for timely examination so as to clarify the cause of the disease and then follow the doctor’s instructions for treatment. Daily need to pay attention to drink more water, diligent urination, should also strengthen personal hygiene care.