Dont miss these 5 Key Signs of Low Estrogen in Perimenopause ( Why It Happens & What Causes It) Perimenopause (late 30s–mid-40s) is when estrogen levels start fluctuating, leading to noticeable body and mind changes. Here’s what to watch for, why it happens, and what causes it. What Leads to a Drop in Estrogen? ✔️ Natural Aging – As the ovaries slow down, estrogen production decreases. ✔️ Chronic Stress – High cortisol levels can disrupt hormone balance. ✔️ Poor Diet & Lifestyle – Lack of health