Leukorrhea or (leucorrhoea British English), also known as fluor albus, is a thick, whitish, yellowish or greenish vaginal discharge.

It can be a natural defense mechanism that the vagina uses to maintain its chemical balance, as well as to preserve the flexibility of the vaginal tissue.

In cases where it is yellowish or gives off an odor, a doctor should be consulted since it could be a sign of several disease processes, including an organic bacterial infection (aerobic vaginitis) or STD.

[8] After delivery, leukorrhea accompanied by backache and foul-smelling lochia (post-partum vaginal discharge, containing blood, mucus, and placental tissue) may suggest the failure of involution (the uterus returning to pre-pregnancy size) due to infection.

Common symptoms of this disease are burning sensation, itching and discharge of frothy substance, thick, white or yellow mucous.