Vaginal secretion, also known as vaginal discharge, is a mixture of liquid, cells, and bacteria that lubricate and protect the vagina. It is constantly produced by the cells of the vagina and cervix, and it exits the body through the vaginal opening. The composition, amount, and quality of discharge varies between individuals and can vary throughout the menstrual cycle and throughout the stages of sexual and reproductive development. Normal vaginal discharge is composed of cervical mucus, vaginal fluid, shedding vaginal and cervical cells, and bacteria. The majority of the liquid in vaginal discharge is mucus produced by glands of the cervix. The rest is made up of transudate from the vaginal walls and secretions from glands (Skenes and Bartholins). The solid components or elements are exfoliated epithelial cells from the vaginal wall and cervix as well as some of the bacteria that inhabit the vagina.

Changes in the amount, consistency, color, or smell of vaginal discharge could indicate an infection or other problem. There are a number of infections that cause vaginal discharge to change or become unpleasant smelling, such as bacterial vaginosis, yeast infections, and sexually transmitted infections like chlamydia and gonorrhea. Its important to see a healthcare provider if you experience any of these changes or other symptoms like vaginal itching, burning, or irritation, painful intercourse, or painful urination. However, normal vaginal discharge is a natural and normal process that helps clean and lubricate the vagina, and helps fight off bad bacteria and infection.