Vaginal inflammation is caused when there is an imbalance in the vaginal flora and the ecological balance is disrupted. The earliest symptom of vaginal inflammation is the sour smell of the vulva, which is usually caused by the following reasons: i. unclean sex; ii. contact with unclean water during bathing and swimming; iii. taking a lot of antibiotics for a long time, which can inhibit the growth of lactobacillus; iv. some women often use gynecological lotions and repeatedly douche the vagina, which can damage the vaginal self-cleaning system; v, Decreased autoimmunity. So women must pay attention to enhance the body, avoid unclean contact and learn to take care of vulva scientifically.