Women feel pain during intercourse just after menstruation because of the following points: First, the vaginal environment is weakly acidic. When menstruation comes, menstrual blood breaks the weakly acidic environment of the vagina. After menstruation, the vagina is in the process of self-repair and self-regulation of the vaginal environment, so it is easy to get vaginitis at this time and you will feel pain during intercourse. Secondly, after a woman has her period, her hormone level is in a basal state, that is, the hormone reaches the lowest point of the physiological process, and the vaginal mucosa is changed by the action of estrogen. However, when estrogen is at its lowest, the vaginal mucosa will become thinner and painful during intercourse. At this time, women must take appropriate measures for intercourse, both parties should pay attention to cleanliness and hygiene, and avoid excessive intercourse, which may cause vaginitis or mucous membrane breakage.