Red urethral opening in women may be caused by diseases such as urethritis, vaginitis and urethral meatus. 1. Urethritis: this disease is mainly caused by gonococcal and non-gonococcal infections, including adenovirus, herpes simplex virus, Mycoplasma solani, Chlamydia trachomatis and so on. The main symptoms are urethral urethral erythema, frequent urination, urinary urgency and so on. 2. Vaginitis: This disease may be caused by pathogenic microorganisms such as Pseudomonas aeruginosa, Trichomonas vaginalis, Escherichia coli, Streptococcus, etc., and it may also be related to estrogen changes, too frequent sex life, etc.. Patients will have symptoms such as vulvar itching, abnormal leukorrhea, urethral redness and swelling. 3. Urethral caruncle: the etiology of this disease is not yet clear, and may be related to the decrease of estrogen level, sexual intercourse stimulation, urethral obstruction and other factors. Its typical symptoms are urethral urethral urethral urethral redness, burning pain and other symptoms, can be urination, sexual intercourse can be significantly aggravated. In addition, red urethra in women may be caused by urethral cancer, urethral stones, cystitis and other diseases. To summarize, there are more causes of urethral redness in women, and it is necessary to go to the hospital for consultation to clarify the cause of the disease.