Redness and pain in the urethral opening may be caused by trauma, urethral stones, glans, urethritis and so on. 1. Trauma: If you suffer from perineal trauma, it can cause redness and pain in the urethra. 2. Urethral stones: some smaller urinary stones, in the process of urethral discharge, there may be urethral urethral urethral urethral red, pain and other symptoms of urinary tract infection, there will be difficulty in urination, pain in urination, dribbling urination and other symptoms of urinary discomfort. 3. Glans: Glans is a kind of inflammation caused by infection, trauma or irritation of the glans, there are many triggers of glans, such as long foreskin, poor hygiene habits, frequent use of irritating detergents, low immune function and so on, may induce glans, after the appearance of glans, the patient will show the redness and pain in the urethral opening. 4. Urethritis: when there is inflammation of the urethra, the urethral opening may be red and swollen, accompanied by frequent urination, urinary urgency, urinary pain and other symptoms. If there is redness and pain in the urethra, consult a doctor in time to give targeted treatment after the cause is clarified by the doctor.