Iron, Anemia & Heavy Periods
Iron deficiency is extremely common in menstruating women, especially with heavy periods, and its symptoms (fatigue, brain fog, feeling cold, hair shedding) are easy to write off as "just being busy" or normal tiredness. It's also one of the more straightforward things to check for and treat.
Last updated August 2026
Why periods and iron are connected
Menstrual blood loss is the single biggest reason iron deficiency is more common in women than men, and it compounds directly with how heavy your periods actually are — see the Abnormal Uterine Bleeding article if your periods are heavier than a typical range. Iron lost each cycle has to be replaced through diet (or supplementation), and for many people with heavier or more frequent periods, typical dietary intake doesn't fully keep up.
What low iron actually feels like
Fatigue that doesn't improve with sleep, brain fog or trouble concentrating, feeling unusually cold, shortness of breath with normal activity, hair shedding, brittle nails, and unusual cravings for ice (a fairly specific sign called pica) are all common. Many people live with these for a long time before connecting them to iron, partly because the symptoms overlap with just being tired or stressed.
Food sources and what affects absorption
Heme iron (from red meat, poultry, and fish) is absorbed far more efficiently than non-heme iron (from beans, lentils, spinach, and fortified grains) — worth knowing if you eat a plant-based diet, since it generally means you need more total iron intake to absorb the same amount. Vitamin C (citrus, bell peppers, strawberries) eaten in the same meal meaningfully boosts non-heme iron absorption. Calcium, coffee, and tea, on the other hand, can reduce iron absorption if consumed at the same meal — a useful thing to know even if none of these need to be avoided outright.
When to get it checked
A simple blood test (ferritin, along with a complete blood count) can confirm low iron stores, often before you're anemic enough to show up on a basic hemoglobin check alone — ferritin is the more sensitive early marker. Worth asking for directly if you have heavy periods, any of the symptoms above, or follow a primarily plant-based diet, rather than waiting for it to come up on its own.
Worth discussing with your provider
Educational information only — general patterns that vary by person. This is not medical advice, a diagnosis, or a substitute for care from your own clinician.
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