If your hair does whatever it likes a week before, or around your period, you already have some idea of what’s going on. Yup, it’s hormones. And, more specifically, Estrogen and Progesterone. As those with hormone-sensitive hair will attest, both play a role in the health, growth and, yes, the obedience of your hair. During the peaks and troughs of a menstrual cycle, those hormone fluctuations can cause more hair loss than usual. It’s generally brief and temporary, though, so for the most part, your hair doesn’t really notice. But once your reproductive system enters Perimenopause, your Estrogen and Progesterone levels rise and fall randomly, and often for prolonged period. During Menopause, they reach their lowest levels, and that’s where they tend to stay once you’re in Postmenopause. All of which can lead to thinning hair and loss, spread out over your scalp, as opposed to in patches or around your hairline. In addition, any regrowth may be thinner and weaker than before.