If you have yellow urine and an itchy urethra, consider having a UTI. It is recommended that you go to the hospital to retain urine, do relevant laboratory tests, and take a symptomatic treatment plan. I. Perform tests for mycoplasma and chlamydia. If there is a history of unclean sexual contact and the above symptoms occur, consider the presence of non-gonococcal urethritis. If culture or urine examination reveals mycoplasma and chlamydia, treatment with macrolide antibiotics is required. Second, bacterial UTI. Symptoms such as frequent urination, urinary urgency, yellow urine, itching in the urethra, burning in the urethra, etc. may occur, which may be accompanied by urethral discharge. It is necessary to take urine, do routine laboratory tests and culture tests to clarify the specific causative organism, and then choose the appropriate antibiotic treatment according to the drug sensitivity test. During the treatment period, sexual intercourse should be avoided to avoid prolonging the inflammation or infecting the sexual partner.