When to worry about fatigue with iron deficiency anaemia

Iron is needed to make haemoglobin, the part of red blood cells that carries oxygen. When iron stores are low and anaemia develops, your muscles and organs may receive less oxygen than they need. This can cause low energy, reduced concentration, headaches, dizziness, breathlessness on exertion, or a fast heartbeat.

Fatigue may have more than one cause, and the reason for low iron should be identified. Heavy menstrual bleeding, pregnancy, limited dietary iron, reduced absorption, or bleeding from the digestive tract are possible contributors. Do not assume that tiredness alone shows how severe the anaemia is.

Book a medical appointment if fatigue is persistent, interferes with ordinary activities, or returns after treatment. A clinician may review symptoms, diet, medicines, menstrual or digestive bleeding, and blood-test results. Take iron treatment only as advised, because the preparation and dose should match your needs.

Keep a record of breathlessness, palpitations, dizziness, bleeding, bowel changes, and any treatment side effects. Iron-rich foods may support recovery, but food changes do not replace assessment of ongoing blood loss or poor absorption.

Seek urgent help for chest pain, severe breathlessness at rest, fainting, confusion, or a very fast or irregular heartbeat. Get prompt advice for vomiting blood, black or bloody stools, heavy ongoing bleeding, or sudden marked weakness.

Arrange timely follow-up when symptoms are not improving as expected, fatigue is worsening, or you develop dizziness or breathlessness with small amounts of activity. Children, pregnant people, and older adults may need a particularly careful review.

Ask what caused the iron deficiency, which tests are needed, how treatment will be monitored, and what side effects should be reported. Ask when your blood count and iron stores should be reassessed, and whether ongoing bleeding needs separate treatment.