The pain in the vagina after sex is related to many factors, mainly the following aspects: 1, the pain is caused by the stimulation of the pubic area during sex, excessive force, and also the pain in the vagina after the reduction of secretion and excessive friction, which is a normal reaction and basically does not need to be treated. 2, the pain may be caused by gynecological diseases, such as vaginitis and pelvic inflammatory disease. It is best to go to the hospital for routine leucorrhea examination and ultrasound to determine the condition of the disease. 3. There may be other diseases, such as malignant tumor, endometriosis, or other physical diseases, which can affect the quality of sexual life and cause painful symptoms in the pubic area.