Gonorrhea is a sexually transmitted disease caused by the infection of Neisseria gonorrhoeae. There are differences in symptoms between infected men and women. In men, gonorrhea generally presents as acute urethritis. Most patients infected with Neisseria gonorrhoeae will experience redness and swelling at the urinary meatus, pain during urination, difficulty in urinating, and a pasty phenomenon at the urinary meatus, accompanied by purulent discharge. Some patients may not show obvious symptoms, only experiencing itching and stinging on the glans penis.