The causes of vaginal dryness are multiple: i. Taking birth control pills regularly for a long time, the progesterone in birth control pills may bring about the side effect of vaginal dryness. Two, excessive work and life stress, resulting in low libido and delayed sexual arousal, and vaginal dryness. Many women think that the leukorrhea is dirty and often repeatedly use lotion to do deep vaginal douching. Excessive cleaning leads to vaginal dryness as the vagina cannot retain the proper secretions and beneficial bacteria. In addition to vaginal dryness, if women also have inflammation at the corners of the mouth, dry skin and flaking, it means that they have an unbalanced diet and may lack vitamin B2, which can lead to dryness of the vaginal wall, mucous membrane congestion and even ulceration. V. If you have vaginitis, the vaginal mucosa will be congested during sex, resulting in less secretion and vaginal dryness.