[Coffee.]

Hormonal changes like birth control, pregnancy, your menstrual cycle and menopause can cause changes in your hair. Additionally, as a teenager, your hair may be changing in texture and oiliness as you develop. I can't pinpoint the cause, but as the previous user stated, talking to your doctor about the side effects you're having is great. You can change birth control, or at least get some answers of what might be happening and make a plan.