Sour vaginal discharge can be caused by gynecological inflammation, which can lead to a change in the nature of vaginal discharge. However, it cannot be excluded that the change in odor is due to summer, hot flashes and sweating in the vaginal area. If there is gynecological inflammation, i.e., the vagina, uterus, ovaries, fallopian tubes and other organs and tissues are attacked by pathogens, causing an inflammatory reaction, which can lead to an increase in the vaginal discharge and a change in its character. Such as bacterial vaginosis, vaginal secretions increased and gray-white, thinner, may have a fishy smell, this time can be anti-infective treatment. If the weather is hot, hot flashes in the pubic area, sweating more, may also cause discharge odor. In daily life, you should pay attention to personal hygiene, keep the pubic area clean and avoid infection. If abnormal discharge or other discomfort occurs, you should go to the hospital as soon as possible, follow the doctor’s instructions to clarify the cause of the symptomatic treatment.