The appearance of pink discharge from the vagina may be due to an impending menstrual period or may be caused by other reasons, depending on the time of the appearance of pink discharge. Irregular shedding of the endometrium may occur before the onset of menstruation due to lowered sex hormone levels, which may cause trace bleeding. The flow out of the vagina may appear as pink discharge with a sticky nature to the naked eye. This is a physiological phenomenon, and in addition to the abnormal discharge, there may be slight abdominal pain, suggesting a slight uterine contraction and the imminent onset of menstruation. If pink vaginal discharge occurs in between periods, it is a small amount of vaginal bleeding caused by ovulation and is not related to menstruation. When acute inflammation of the genital tract occurs, such as acute cervicitis or vaginitis, a small amount of fresh bleeding may occur due to local mucosal congestion and edema; this bleeding is not viscous accompanied by vaginal itching and painful symptoms and is also unrelated to menstruation.