Why is it that when your period comes a little bit, it's gone?

Menstruation to a little bit on the no, more common reasons are as follows: First, first of all to rule out pregnancy. Abortion, ectopic pregnancy will be manifested as a little vaginal bleeding, do urine pregnancy test or blood HCG can be further clarified. Second, to consider indoor endocrine factors or improper use of sex hormones, IUD foreign body stimulation will also cause a small amount of vaginal bleeding. Third, consider inflammation: including vaginitis, cervicitis and endometriosis. Fourth, intrauterine adhesions can also cause less vaginal bleeding. Fifth, premature ovarian failure, ovarian function tumors and hypophysis, pituitary tumors can also cause less menstrual phenomenon.