The 6th month of pregnancy belongs to the mid-term pregnancy, normally during this time period, the pregnant woman’s body is relatively comfortable and there are no obvious symptoms of discomfort. The possible causes of the pain and discomfort in the lower body, including the vagina and vulva, include: 1. the occurrence of urinary tract stone disease during pregnancy, which causes radiated pain in the ureter and can be implicated in causing pain in the vulva. 2. the rapid increase in the abdomen of pregnant women, which compresses the inferior vena cava and causes impaired blood circulation in the vulva, resulting in varicose veins and edema in the vulva and causing pain. 3. 3.Pregnant women suffer from vulvovaginitis, vaginitis, vestibular glanditis, hair follicle infection and other diseases due to poor hygiene habits or tight underwear, causing local pain in the vulva.