Anaemia is when the blood contains less haemoglobin than it should. Haemaglobin is the component of blood responsible for transporting oxygen. It can be caused by having smaller than usual red blood cells, which contain haemoglobin, or having increased volume of plasma in your blood - this can happen during pregnancy for example.
Fatigue and difficulty breathing, along with an awareness of your heartbeat, are common symptoms. Anaemia is generally treated with replacement iron substances, and in very severe cases a blood transfusion may be required.
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