My gf always have issues in her vagina, something like mucus usually come out of her vagina and it stains her pants always.. which makes her uncomfort?

Various reasons: Vaginal discharge requires an examination to determine the cause and treatment. Bacterial vaginosis is the most common cause and often has a vaginal odor. Vaginal itching can be a sign of a yeast infection. Sometimes vaginal discharge can be a sign of a sexual transmitted infection. Testing is important to determine the treatment and keep you and your partner safe.