Iron Deficiency Anemia in Women: Symptoms, Causes, and Treatment

Iron Deficiency Anemia in Women

Iron deficiency anemia (IDA) is the most common nutritional deficiency worldwide, affecting approximately 1.2 billion people. Women of reproductive age are at particularly high risk due to menstrual blood loss.

Why Women Are at Higher Risk

• Menstruation: The average woman loses 30-80 mL of blood per period. Heavy periods (menorrhagia) can cause significant iron loss.
• Pregnancy: Iron requirements nearly double during pregnancy (27 mg/day vs. 18 mg/day) to support fetal development and increased blood volume.
• Lower dietary intake: Women tend to consume fewer calories and less red meat than men.
• Vegetarian/vegan diets: Plant-based iron (non-heme) is less bioavailable than animal-based iron (heme).

Symptoms of Iron Deficiency Anemia

Classic symptoms:

• Fatigue and weakness (most common)
• Pale skin, pale inner eyelids (conjunctival pallor)
• Shortness of breath with exertion
• Rapid or irregular heartbeat
• Headaches
• Cold hands and feet

Less common but specific symptoms:

• Pica — craving non-food substances (ice, dirt, clay)
• Restless legs syndrome
• Brittle nails or spoon-shaped nails (koilonychia)
• Hair loss
• Sore or swollen tongue (glossitis)
• Difficulty swallowing (in severe cases)

Stages of Iron Deficiency

1. Iron depletion: Stored iron (ferritin) decreases; no symptoms yet
2. Iron-deficient erythropoiesis: Red blood cell production becomes impaired; mild symptoms
3. Iron deficiency anemia: Hemoglobin falls below normal; full symptom picture

Diagnosis

Blood tests:

• Hemoglobin: Low (< 12 g/dL in women)
• Ferritin: Most sensitive early marker (< 12 ng/mL = deficient; < 30 ng/mL = suboptimal)
• Serum iron: Low
• TIBC (Total Iron Binding Capacity): High
• Transferrin saturation: Low (< 16%)

Treatment

Oral iron supplements:

• Ferrous sulfate (325 mg, containing 65 mg elemental iron) is most common
• Take on an empty stomach for best absorption (if tolerated)
• Vitamin C enhances absorption; calcium, tea, and coffee inhibit it
• Side effects: constipation, nausea, dark stools — take with food if needed
• Expect 2-3 months to replenish stores after hemoglobin normalizes

IV iron:

Used when oral iron is not tolerated, not absorbed, or when rapid repletion is needed (e.g., pre-surgery, severe anemia).

Addressing the underlying cause:

• Heavy periods: hormonal treatment, IUD, or investigation for fibroids/endometriosis
• GI bleeding: colonoscopy, endoscopy
• Malabsorption: celiac disease testing

Medical Disclaimer

Iron deficiency anemia requires diagnosis and monitoring by a physician. Do not self-supplement with high-dose iron without medical supervision.