There are various reasons that lead to female perineal swelling, such as vaginitis, perineal varicose veins, vestibular cysts, etc. It is specifically recommended to go to the regular hospital to do a checkup to make a clear diagnosis, and the common causes are described as follows: 1. Vaginitis: Trichomonas vaginitis, acute mycobacterial vaginitis, etc. will lead to increased vaginal discharge, vulvar burning, vulvar itching, etc. As a result of inflammation stimulation, it will also lead to female perineum congestion and swelling. 2. Perineal varicose veins: the manifestation of varicose veins, the symptoms of frequent perineal, or lower abdominal distension and discomfort, some patients may experience pain during sexual intercourse. 3. Vestibular cysts: small cysts without acute infection can be asymptomatic, while large cysts can cause swelling and discomfort in the perineum and vulva, or pain during sexual intercourse. It is recommended that women should consult a doctor as soon as perineal swelling occurs, so as not to delay the condition.