1 Normal vaginal itch: This occurs in most women around the time of their period. 2  This usually happens due to a drop in estrogen levels, which leads to the thinning and inflammation of the vaginal wall. 3  It is normal for this to be accompanied by a stinging sensation around the vaginal opening and lower third of vagina.here are two types of vaginal itch: 1  Normal vaginal itch: This occurs in most women around the time of their period. 2  This usually happens due to a drop in estrogen levels, which leads to the thinning and inflammation of the vaginal wall.