How common is shortness of breath in anaemia?

Red blood cells carry oxygen around the body. With anaemia, there may be fewer red blood cells or less haemoglobin available to carry oxygen. Your heart and lungs may then work harder during activity, and you may notice that walking, climbing stairs, or carrying shopping leaves you breathless. The feeling may come with tiredness, reduced exercise tolerance, palpitations, dizziness, or looking paler than usual.

How noticeable the symptom feels can vary with the degree and speed of change in the anaemia, your usual activity level, and whether you have a heart or lung condition. Breathlessness alone does not identify its cause, so it needs assessment in the context of your other symptoms and medical history.

Arrange a medical appointment if new breathlessness persists, limits ordinary activities, or occurs alongside fatigue or light-headedness. A clinician can discuss possible causes and may arrange a blood test to check for anaemia. They will also consider factors such as heavy menstrual bleeding, dietary intake, pregnancy, recent bleeding, stomach or bowel symptoms, and medicines.

Until you are assessed, pace activities that make you markedly breathless and rest when needed. Do not start iron supplements solely because you feel breathless; the appropriate treatment depends on the type and cause of anaemia.

Seek urgent medical help for sudden or severe shortness of breath, breathlessness at rest, chest pain, fainting, confusion, blue or grey lips, or coughing up blood. Get prompt advice if breathlessness is worsening quickly or follows significant bleeding. These features need timely assessment because they can signal problems that should not be managed at home.

You could ask whether a blood test is appropriate, what might be causing any anaemia, and whether your breathing symptoms need checks for another condition. Mention when the breathlessness began, which activities trigger it, any bleeding, changes in your diet, and all medicines or supplements you take.