Read about eight reasons why you may have itching in the groin. Wearing tight-fitting synthetic clothing is a common cause, but there are many others as well. Women seem especially prone because products, such as vaginal douches. Ob-gyns explain the most common causes of vaginal itching, like yeast Acidity in the vagina is actually a good thing, as it kills off bad bacteria. The condition is so common that it happens to three in every four women, All these do not just cause vaginal itching but many other painful. Vaginal itching after swimming is not fun and could be the result of sitting in a wet swimming suit for too long or from the chlorine in the pool. Many.