The causes of pain in the labia are: 1. traumatic riding injuries that damage the labia and cause pain. 2. gynecological inflammation that spreads to the labia and causes pain. common ones are vulvovaginitis, inflammation that causes dryness and cracking of the labia and pain. mycotic vaginitis, trichomonas vaginitis, bacterial vaginitis, the discharge contains a large number of germs that stimulate the labia, causing the labia to be moist and the surface of the labia to breed bacteria, causing pain in the labia. 3. chronic cervicitis and pelvic inflammatory disease that spreads to the labia and causes pain in the labia. Chronic cervicitis and pelvic inflammatory disease will spread to the labia and cause pain and itching of the labia. 3. The content of uric acid in urine is relatively large and lack of attention to perineal cleanliness causes acidic tissue to adhere to the vaginal opening and stimulate the skin of the labia to form stinging pain. 4. Pain in the labia can also be caused by abscesses of the Bartholin’s gland or when the skin of the vulva area becomes malignant.