The main symptoms of UTI include difficulty urinating, itching of the urethra and mucus, mucopurulent or purulent discharge. There are some differences in the symptoms of urethritis caused by different etiologic factors. 1. Gonococcal urethritis: the causative organism is mainly gonococcus, which adheres to the surface of urethral cells through its hairs, causing local inflammation. At the beginning of the disease, the main manifestations of frequent urination, urinary urgency, urinary pain, followed by urethral congestion and swelling and accompanied by thin mucus discharge, the disease progresses rapidly, more than one day after the thin mucus discharge into a large amount of purulent secretion. 2. Non-gonococcal urethritis: the main causative organisms are Chlamydia trachomatis, Mycoplasma genitalium, Trichomonas vaginalis and some viruses. Most patients have no obvious symptoms. Symptoms are mostly manifested as painful urination, frequent urination, urethral itching, urethral white thin secretion, mostly in the morning. In women, it may be accompanied by increased leukorrhea and odor. In summary, the symptoms of urethritis vary and should be treated promptly.