A 4-year-old child’s vaginal pain may be caused by trauma, or it may be due to diseases such as vulvovaginitis and urethritis. 1. Trauma, if the child’s vagina is hit by external forces or stabbed by foreign objects in the course of activities, it may lead to the symptoms of vaginal pain. 2. Vulvovaginitis, if the child has vulvovaginitis, the vulva is stimulated by inflammatory secretions, which may lead to congestion and edema of the vulva, and there may also be skin erosion and ulceration and other problems, which may lead to symptoms of vaginal pain in children. 3. Urethritis, some patients with urethritis, increased secretions, skin and mucous membrane damage may occur child vaginal pain symptoms. 4 year old children may also have other causes of pain, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.