The answer is Vestibulodynia. Vestibulodynia is a severe pain at the entrance of the vagina, vestibulodynia is known as the most common cause of painful intercourse/sex. Vestibulodynia is difficult to be seen by the naked eye, but it is a small reddened area, which is extremely sensitive, that even light pressure causes pain. The treatment used for this illness is surgery or intake topical medicines prescribed by the doctor to ease and remove the pain.