Leucorrohoea or Leukorrhea is a thick, whitish, yellowish or greenish vaginal discharge. It is usually a non-pathological symptom. There are many causes of Leucorrohoea, the usual one being estrogen imbalance. The amount of discharge may increase due to vaginal infection and reappear from time to time. This discharge can keep occurring for years, in which case it becomes more yellow and strong.