condition-guides

Iron Deficiency Anemia and Heavy Periods

Heavy periods are the most common cause of iron deficiency anemia in premenopausal people. Learn what to track and when to get tested.

What Heavy Periods Do to Your Iron Levels Every menstrual cycle depletes iron. The body replaces it through dietary absorption, but there is a limit to how much iron the gut can absorb daily. When menstrual blood loss consistently exceeds replacement capacity, iron stores drop. First ferritin falls. Then, once iron reserves are exhausted, hemoglobin drops, and anemia develops. This process is gradual. Heavy periods do not produce sudden anemia; they produce a slow decline that people adapt to. You get used to being tired. You attribute breathlessness to being out of shape. You assume everyone feels lightheaded when they stand up quickly. By the time many people are diagnosed, their ferritin is profoundly low. Tracking your bleeding patterns is the early detection system that blood tests alone miss, because blood tests only happen when someone thinks to order them. This content is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. What to Track Flow volume with specificity. "Heavy" is subjective and unhelpful. Track product type, product changes per day, and saturation level. Note whether you double up (pad plus tampon),