A white foreign body blocking the urinary orifice can be caused by urethritis, prostatitis and vaginitis. 1. Urethritis: It is a common clinical disease, mostly caused by urethral injury, infection and unclean sex. In the acute stage, the patient may have urethral secretion, so there may be the phenomenon of a white foreign body blocking the urinary orifice. 2. Prostatitis: mainly due to pathogenic infections caused by the patient will usually be manifested in frequent urination, urinary urgency, urinary pain, urinary incontinence, urinary dribbling and other phenomena, may also lead to a white foreign body blocked in the urinary orifice of the situation. 3. Vaginitis: mostly caused by bacterial infection and trichomonas infection. The patient mostly manifests vaginal itching, bleeding and white dribbling discharge, so there may also be white foreign body blocked in the urinary orifice phenomenon. To summarize, there are many reasons for the above phenomenon, and it is recommended that patients go to the hospital in time to clarify the cause of the disease and target treatment.