Does iron deficiency anaemia cause fatigue?

Haemoglobin is the part of red blood cells that carries oxygen. When iron stores are low, the body may make red blood cells with less haemoglobin. Everyday activity can then feel more draining, and concentration or exercise may be harder than usual. Fatigue can have many causes, including poor sleep, infection, stress, thyroid problems and other forms of anaemia, so it needs assessment rather than self-diagnosis.

Arrange a clinical review if tiredness persists or affects work, school or normal routines. A clinician can discuss your diet, menstrual bleeding, pregnancy, medicines, digestive symptoms and any blood loss, then decide whether blood tests are appropriate. Do not start high-dose iron solely on the basis of fatigue; treatment should match the cause and follow medical advice. Keep a brief note of when fatigue occurs and what makes it better or worse.

Seek urgent medical care for fatigue with chest pain, severe shortness of breath, fainting, confusion, black stools, vomiting blood or heavy bleeding. Prompt assessment is also sensible if tiredness is rapidly worsening, follows a major bleed, or comes with a new fast heartbeat. These warning signs need attention even when the cause is not yet known.

Ask what tests could clarify whether iron deficiency or anaemia is present, what may be causing it, and whether diet changes, iron treatment or further checks are suitable. If treatment is prescribed, ask how to take it, which side effects to watch for and when symptoms or blood results should be reviewed.