Vaginal dryness and pain during sex can be caused by the following reasons: 1. Ovarian function decreases, estrogen secretion decreases, cervical and vaginal secretions decrease, and the local mucous membrane of the vagina becomes thinner, so dryness and pain occur during sex. You can have blood test for sex hormone 6 to understand ovarian function. 2. Local inflammation of the vagina. When there is local inflammation of the vagina, it will firstly show local redness, swelling, heat and pain, which will also lead to vaginal dryness and pain during intercourse. To actively treat vaginal inflammation, first check the white belt routine and give appropriate medication according to the pathogenic bacteria of the infection, the symptoms will be relieved soon.