What Causes A Light Period?
Hormone Imbalance

Hormones are a big part of a woman's menstrual cycle, and an imbalance will more than likely affect your period. The two hormones responsible for your cycle are estrogen and progesterone. Their amounts increase and decrease at various points throughout your cycle, and any fluctuation will affect your period. For example, estrogen is responsible for thickening the lining of the uterus, so an insufficient of the hormone will result in a thinner lining. There will be much less shedding and bleeding in that case. High levels of testosterone can also cause light periods. High levels of this hormone may alter the menstrual cycle by suppressing ovulation. If your periods have suddenly become much lighter, it may be a sign of a hormone imbalance. Your doctor can run a hormone test and prescribe the proper medication to get you back on track.