Iron Deficiency and Anemia in Women: Why You're Always Tired

TL;DR: Iron deficiency is the most common nutritional deficiency in the world, and women are hit hardest, because of periods, pregnancy, and breastfeeding. Symptoms include constant fatigue, weakness, pale skin, dizziness, and brittle nails. The good news: it's easy to diagnose with a blood test and very treatable with the right diet, supplements, or medical support.

You're sleeping eight hours a night and still waking up exhausted. You're dragging yourself through the afternoon. You feel out of breath climbing a single flight of stairs. Everyone around you seems to have more energy than you do, and you're starting to wonder if something is actually wrong.

Something might be. And it could be your iron levels.

Iron deficiency is the most common nutritional deficiency worldwide, affecting roughly 1 in 3 women of reproductive age according to the World Health Organization. In sub-Saharan Africa, the numbers are even higher. It's one of the most underdiagnosed reasons women feel constantly drained, and one of the most treatable once you know what you're dealing with.

What Is Iron Deficiency? And What Is Anemia?

Let's clarify these two terms, because they're related but not the same thing.

Iron deficiency means your body doesn't have enough iron stored to do what it needs to do. Iron is an essential mineral your body uses to make hemoglobin (HEE-moh-glow-bin), a protein in your red blood cells that carries oxygen from your lungs to the rest of your body. Without enough iron, your body can't make enough healthy red blood cells.

Anemia (ah-NEE-mee-ah) is a condition where you don't have enough healthy red blood cells to carry oxygen effectively to your tissues. Iron deficiency is the most common cause of anemia, which is why you'll often hear the full name: iron deficiency anemia.

Think of it this way: iron deficiency is like running low on fuel. Anemia is what happens when you've been running on empty long enough that your body starts to struggle.

You can be iron deficient without being anemic yet, your stores are low, but your body is still managing. But if it goes unchecked, iron deficiency almost always leads to anemia.

Why Are Women Especially at Risk?

This isn't a coincidence. Women are biologically more vulnerable to iron deficiency for several reasons.

Monthly blood loss from periods

Every time you menstruate, you lose blood, and with it, iron. The heavier your periods, the more iron you lose. Women with heavy periods (medically called menorrhagia) are at significantly higher risk. If you're soaking through pads every hour, passing large clots, or bleeding for more than seven days, your iron stores are taking a hit every single cycle.

Fibroids

Uterine fibroids (non-cancerous growths in the uterus) are one of the most common causes of heavy menstrual bleeding, particularly in Black women. If fibroids are making your periods heavier, they could be quietly draining your iron over months or years.

Pregnancy and breastfeeding

During pregnancy, your body needs dramatically more iron, nearly double your usual requirement, to support the growing baby, the placenta, and your increased blood volume. If you go into pregnancy with low iron stores, anemia can develop quickly. Breastfeeding also continues to draw on your iron reserves. (Our pregnancy nutrition guide covers this in more detail.)

Dietary intake

If your diet is low in iron-rich foods, or if you follow a strictly plant-based diet without planning for iron, deficiency can build up over time. This is especially relevant in settings where access to diverse, nutrient-rich food is limited.

Symptoms: What Iron Deficiency Actually Feels Like

Iron deficiency anemia doesn't always arrive with loud, obvious symptoms. It often creeps in gradually, which is why so many women dismiss it as "just being tired" or "overdoing it." But the signs are there if you know what to look for.

Common symptoms include:

• Fatigue and exhaustion, The kind that sleep doesn't fix. You feel depleted at a cellular level, because your cells literally aren't getting enough oxygen.
• Weakness, Everyday tasks feel harder than they should.
• Pale skin, Especially noticeable in your face, inner lower eyelids, nail beds, and gums.
• Brittle or spoon-shaped nails, Your nails may crack, chip easily, or curve inward (a sign called koilonychia, pronounced koy-loh-NIK-ee-ah).
• Dizziness or lightheadedness, Especially when standing up quickly.
• Cold hands and feet, Even in warm weather.
• Headaches, Particularly with physical activity.
• Shortness of breath, Getting winded doing things that didn't used to bother you, like walking upstairs or carrying groceries.
• Heart palpitations, A racing or pounding heartbeat, because your heart is working harder to compensate for fewer oxygen-carrying red blood cells.
• Difficulty concentrating, Brain fog that makes it hard to think clearly or stay focused.
• Unusual cravings (pica), This is a lesser-known but very real symptom. Some women develop cravings for non-food items like ice, clay, dirt, or starch. Compulsive ice chewing is particularly common with iron deficiency. If you find yourself constantly crunching ice, it's worth getting your iron checked.
• Poor sleep, Restless legs, difficulty falling asleep, or unrefreshing sleep can all be linked to low iron levels.

If several of these sound familiar, don't brush them off. Your body is trying to tell you something.

What Causes Iron Deficiency in Women?

We've touched on the main drivers, but let's lay them out clearly.

1. Heavy menstrual bleeding

This is the single most common cause in women of reproductive age. If your periods are heavy, whether from fibroids, hormonal imbalances (including PCOS), polyps, or a bleeding disorder, you're losing more iron than your body can easily replace.

2. Pregnancy

The demands of growing a baby can deplete iron stores rapidly, especially in the second and third trimesters when the baby's blood supply is developing.

3. Not enough iron in your diet

Your body can't make iron, you have to get it from food. If your diet is consistently low in iron-rich foods, your stores will gradually run down.

4. Poor iron absorption

Some conditions make it harder for your body to absorb iron from food, even if you're eating enough of it. These include celiac disease (an autoimmune reaction to gluten), inflammatory bowel disease, and certain gut surgeries.

5. Other sources of blood loss

Anything that causes chronic blood loss can contribute, including stomach ulcers, regular use of aspirin or anti-inflammatory medications, and rarely, conditions affecting the digestive tract.

How Is Iron Deficiency Diagnosed?

The good news: diagnosing iron deficiency is straightforward. Your doctor will order a simple blood test, usually drawn from your arm, that checks several key markers.

The blood tests to ask for

• Ferritin (FAIR-ih-tin), This is the most important test. Ferritin measures your body's iron stores. A low ferritin level is the earliest sign of iron deficiency, often dropping before you become anemic. Levels below 30 ng/mL generally indicate depleted stores, even if your other numbers still look normal.
• Hemoglobin (HEE-moh-glow-bin), This measures the oxygen-carrying protein in your red blood cells. The WHO defines anemia in women as hemoglobin below 12 g/dL (or below 11 g/dL in pregnancy).
• CBC (Complete Blood Count), This gives a broader picture of your blood cells, including the number, size, and shape of your red blood cells. In iron deficiency, red blood cells tend to be smaller and paler than normal.
• Serum iron and TIBC (Total Iron-Binding Capacity), These tests show how much iron is circulating in your blood and how much your blood can carry. In iron deficiency, serum iron is low and TIBC is high (your body is reaching for more iron than it has).

If you've been feeling exhausted and your doctor hasn't checked your ferritin, ask for it specifically. Hemoglobin can look normal while your iron stores are already running dangerously low.

Treatment: How to Get Your Iron Back Up

Treatment depends on how severe your deficiency is and what's causing it.

Iron supplements (for mild to moderate deficiency)

Oral iron supplements are the most common first step. Your doctor will likely recommend ferrous sulfate, ferrous gluconate, or ferrous fumarate tablets. A typical dose is 65 to 200 mg of elemental iron per day.

A few things to know about iron supplements:

• Take them on an empty stomach if you can, iron absorbs better this way. But if they upset your stomach (which is common), taking them with a small amount of food is fine.
• Side effects are real, Constipation, nausea, dark stools, and stomach cramps are common. If one type of iron bothers you, ask your doctor about switching to a different formulation. Liquid iron or iron bisglycinate tend to be gentler on the stomach.
• It takes time, You may start feeling better within a few weeks, but it typically takes 3 to 6 months of consistent supplementation to fully restore your iron stores. Don't stop early, even if you feel better.

Iron-rich foods (for prevention and alongside treatment)

Supplements work, but food is your long-term strategy. There are two types of dietary iron:

• Heme iron, Found in animal products. Your body absorbs this type more efficiently (about 15 to 35% absorption). Sources include red meat, liver, chicken, and fish.
• Non-heme iron, Found in plant foods. Absorbed less efficiently (about 2 to 20%), but still valuable, especially when paired with vitamin C. Sources include beans, lentils, dark leafy greens, and fortified cereals.

Iron-rich foods accessible in African diets

You don't need expensive supplements or imported superfoods. Many everyday foods across Africa are excellent sources of iron:

• Dark leafy greens, Ugwu (fluted pumpkin leaves), sukuma wiki (collard greens), spinach, amaranth leaves (efo tete), and moringa leaves
• Beans and lentils, Black-eyed peas, kidney beans, cowpeas, and brown or green lentils
• Red meat and organ meats, Beef, goat, and especially liver (one of the richest sources of iron available)
• Fish and seafood, Sardines, mackerel, and crayfish
• Fortified foods, Some flours and cereals are fortified with iron
• Eggs, Particularly the yolks
• Nuts and seeds, Pumpkin seeds, sesame seeds, and groundnuts (peanuts)
• Whole grains, Millet, sorghum, and fortified maize flour

IV iron (for severe deficiency)

If your anemia is severe, if you can't tolerate oral supplements, or if you need your levels up quickly (for example, before a surgery or late in pregnancy), your doctor may recommend intravenous (IV) iron. This is given through a drip, usually in a hospital or clinic, and it bypasses the gut entirely, delivering iron directly into your bloodstream. It works much faster than pills.

Tips for Better Iron Absorption

How you eat your iron matters just as much as what you eat.

What helps absorption

• Vitamin C is iron's best friend. Eating vitamin C-rich foods alongside iron-rich meals can dramatically improve absorption, by up to 6 times for non-heme iron. Think: a squeeze of lemon on your beans, tomato stew with your spinach, orange slices after a meal, or mango as a snack.
• Cooking in cast iron pots can actually add small amounts of iron to your food, especially with acidic dishes like tomato-based stews.

What blocks absorption

• Tea and coffee contain tannins and polyphenols that can reduce iron absorption by up to 60%. Try to wait at least an hour after eating before drinking tea or coffee.
• Calcium, Dairy products and calcium supplements can interfere with iron absorption. Avoid taking them at the same time as your iron supplement.
• Phytates, Found in whole grains and legumes, phytates can bind to iron and reduce absorption. Soaking beans before cooking helps reduce phytate content.

A practical approach: take your iron supplement with a glass of orange juice or water (not tea), and save your coffee or tea for between meals rather than with them.

When to See a Doctor

Don't wait until you're barely functioning. See a healthcare provider if:

• You have persistent fatigue that doesn't improve with rest or better sleep
• You're experiencing several of the symptoms listed above
• Your periods are very heavy or have become heavier over time
• You're pregnant or planning to become pregnant
• You're craving ice, clay, or other non-food substances
• You've been taking iron supplements for several weeks with no improvement
• You feel faint, have chest pain, or are severely short of breath, these could indicate severe anemia and need urgent attention

Iron deficiency anemia is common, but that doesn't mean it's harmless. Untreated severe anemia can put strain on your heart, complicate pregnancy, and significantly reduce your quality of life. A simple blood test can give you answers.

The Bottom Line

If you've been blaming your exhaustion on a busy schedule, poor sleep, or "just getting older", it might be time to check your iron. Iron deficiency is incredibly common in women, and it's one of the most fixable causes of chronic fatigue.

You don't have to power through feeling terrible. Get tested, get treated, and get your energy back.

References

1. World Health Organization. "Anaemia." who.int
2. World Health Organization. "Iron Deficiency Anaemia: Assessment, Prevention and Control." who.int
3. Mayo Clinic. "Iron Deficiency Anemia." mayoclinic.org
4. National Institutes of Health (NIH), Office of Dietary Supplements. "Iron, Fact Sheet for Health Professionals." ods.od.nih.gov
5. PMC. "Iron Deficiency Anaemia in Women: A Practical Guide to Detection and Management." pmc.ncbi.nlm.nih.gov
6. Cleveland Clinic. "Iron-Deficiency Anemia." clevelandclinic.org

Related posts on Asele:

• Heavy Periods: What's Normal, What's Not, and What to Do
• Uterine Fibroids: What Every Woman Needs to Know
• Pregnancy Nutrition: What to Eat When You're Expecting
• PCOS Explained: Symptoms, Causes, and What You Can Do About It
• Sleep and Hormones: Why Women Struggle With Sleep and What Helps