Vaginismus is the discharge of gas from the vagina. The common causes are as follows: 1. Congenital developmental abnormalities: seen in congenital relaxation of the vaginal wall, poor elasticity of the pelvic floor muscles, and the vagina can not be tight, air into the vagina.2. Childbirth: pregnancy and childbirth can lead to the pelvic floor muscle tendons, muscle fiber rupture, vaginal laxity, dilation of the vaginal orifice, air into the vagina, when abdominal pressure is increased or suddenly upright can appear air discharged by the vagina, and accompanied by a strange sound.3, Gynecological inflammation: in addition to leukorrhea, vulvar redness, swelling, itching and other symptoms, sometimes can also be accompanied by a small amount of gas discharge from the vagina. It is a small amount of gas produced by the pathogens that cause infections, such as reproduction and differentiation in the body. Vaginal blowout is mainly treated symptomatically, and you can usually do more uterine contraction exercises.