Causes of spoties instead of blood flow during menses?

Light periods: There are too many causes of missed, irregular or light periods to describe here. Most women who have a light or irregular period do not have serious underlying condition.

You are spotting at: The time you would normally menstruate. The main reason for light periods is a change in hormone levels. Causes for what seems to be a light period can include: implantation bleeding in early pregnancy, thyroid problems, eating disorders, excessive exercise, initial periods for a girl, use of an intrauterine device, oral contraceptives ; perimenopause.