White mucus in the urine may be caused by pus urine, celiac disease, crystal urine, semen and other reasons. 1. Pus urine: after urinary tract infection, resulting in elevated pus cells in the urine, there will be white mucus in the urine. Most commonly seen in cystitis, renal tuberculosis, gonorrheal urethritis, etc. Patients may be accompanied by urinary frequency, urgency, urinary pain, fever, lumbago and other symptoms. Urine routine will suggest that pus cells are significantly elevated. 2. Celiac disease: filarial infection, malignant tumor, tuberculosis and other diseases lead to celiac fluid into the urine can also lead to milky mucus in urine. 3. Crystalluria: The increase of crystalline substances in the urine will also lead to white mucus discharge in the urine. This condition is mostly seen in children, usually no discomfort symptoms, drink more water can improve. 4. Semen: some patients with retrograde ejaculation, ejaculation of semen into the bladder, along with the urinary discharge will be presented as white mucus. Overall, white mucus should be taken seriously, go to the hospital in time to check the cause of the disease and treatment.