What does fatigue feel like with iron deficiency anaemia?

You might tire during activities that previously felt manageable, need more rests, or feel physically drained after a normal day. Some people describe difficulty concentrating, headaches, dizziness, paleness, a racing heartbeat, or feeling short of breath when walking or climbing stairs. Iron is needed to make haemoglobin, which carries oxygen in the blood; when haemoglobin is low, tissues may receive less oxygen and effort can feel harder. These symptoms can overlap with other conditions, so the sensation alone cannot identify the cause.

Book a medical assessment if fatigue is persistent or affects daily activities. A clinician may ask about diet, menstrual or other bleeding, digestive symptoms, pregnancy, medicines, and previous blood results, then decide whether blood tests are appropriate. Do not start iron supplements without advice, because the right treatment depends on the cause and the amount needed. Record when fatigue began, what activity brings it on, and any dizziness, paleness, breathlessness, or bleeding.

Seek prompt medical advice for worsening breathlessness, repeated dizziness, fainting, a very fast or irregular heartbeat, unusual bleeding, or black stools. Get emergency help for severe breathlessness, chest pain, collapse, or new confusion.

Ask which tests could clarify the cause, whether bleeding needs investigation, how to take any prescribed iron, and when your symptoms should be reviewed.