Dryness in the vagina may be caused by taking birth control pills, mycosis vaginalis or ovarian failure. Depending on the situation, it is necessary to stop taking the pill, use symptomatic drugs and other ways to regulate the treatment. 1. Taking birth control pills: If you take birth control pills regularly for a long period of time, the progesterone in the pills may bring the side effect of vaginal dryness. Generally stopping the pill for 3 to 6 months will be able to return to normal, the side effects of the pill is large, can not be taken regularly, during the period of taking the pill can increase the intake of food with high vitamin C content. 2. Mycotic vaginitis: If you suffer from vaginitis, the vaginal mucosa will be congested during sex, resulting in reduced secretions and vaginal dryness. For the treatment of mycotic vaginitis preferred intravaginal local medication, commonly used drugs are mainly mycotoxin, clotrimazole, etc., can effectively relieve the vaginal dryness. 3. Ovarian function decline: due to ovarian function decline, estrogen level decreases, the vaginal secretion decreases, it will lead to vaginal dryness. You can relieve the symptoms by supplementing estrogen locally in the vagina under the guidance of your doctor, such as estriol cream and combined estrogen cream. If the symptoms of vaginal dryness occur for a long time, it is an abnormal manifestation, you should go to the hospital in time, and use medication under the guidance of the doctor, do not blindly self-medication, in order to avoid adverse effects.