The redness, swelling, itching and pain of the glans may be caused by circumcision and glansitis, traumatic factors or gonorrhea urethritis. 1. Foreskin glansitis: it is mostly due to bacteria, candida and other pathogens infection caused by not paying attention to daily care or unclean sexual behavior, which may lead to symptoms such as red, swollen, itchy and painful glans. 2. Traumatic factors: If the glans is hit by external force in daily life, or the sex life is too strenuous and other reasons, resulting in trauma to the glans, the glans may be red, swollen, itchy, painful and other symptoms. 3. Gonococcal urethritis: Urethral disease caused by gonococcal infection usually leads to symptoms such as redness, swelling, itching and pain of the glans. If the patient has a red, swollen, itchy and painful glans, he should consult a doctor for examination and treatment under the guidance of the doctor to avoid delaying the condition and causing discomfort to the body.