There are several reasons for vaginal itch after intercourse: 1. a normal physiological phenomenon, because when women are sexually excited, vaginal blood vessels will expand and vascular permeability will increase, some substances will filter from the blood vessels to the vaginal wall, which will stimulate the skin mucous membrane on the vaginal wall, thus producing the feeling of vaginal itch after intercourse. 2. consider whether there is infection, i.e. whether women are suffering from gynecological diseases. When women suffer from gynecological diseases, the stimulation of the skin and mucous membrane of the vaginal wall after intercourse will lead to an increase in local blood flow and blood flow, plus the infection of vaginitis itself, which will lead to an increase in the secretion of vaginal inflammatory substances and excessive secretion to the mucous membrane of the vaginal wall, which will also stimulate the sensory nerves on the mucous membrane of the vaginal wall, thus causing women to feel itchy after intercourse.