Itching in the urethra, possible causes: First, non-gonococcal urethritis, which is more common and is seen in infections with mycoplasma and chlamydia. The source of infection mostly comes through sexual contact, transmitted by the partner. The primary symptom is itching in the urethra, with frequent urination, urinary urgency, painful urination and other discomfort. A thin discharge, often white or sometimes yellowish, is visible from the urethral orifice, and a white or yellow crust is visible on the underwear. It is recommended to keep the discharge from the urethra for culture of mycoplasma and chlamydia, and to keep urine for culture of mycoplasma and chlamydia. If the culture is positive, the diagnosis can be confirmed and treatment such as intravenous infusion of azithromycin or oral administration of roxithromycin is required. Second, acute bacterial urethritis, can also appear in the urethra itching symptoms, but often urinary tract irritation symptoms are heavy, there is a significant urinary frequency, urinary urgency, painful urination. Generally there is no discharge, sometimes there can be yellow discharge appear. It is recommended that urine be retained for routine examination and bacterial culture examination, and if pathogenic bacteria are cultured, anti-infective treatment is given.