Urethritis is an inflammatory lesion of the urethral mucosa caused by pathogen infection, and its clinical symptoms include the following: 1, some patients have no obvious symptoms, or only discomfort in urination; 2, urinary tract irritation: such as urinary frequency, urgency, painful urination, urethral urethral redness and swelling; 3, urethral discharge: gonococcal infection can be manifested as urethral urethral redness and swelling with a large amount of pus secretion; chlamydia or mycoplasma infections can be manifested as a small amount of mucous secretion; 4, itchy urethra.