Anaemia is a low number of red blood cells. Many people with cancer will develop it at some point during their illness. This can be due to the cancer or caused by cancer treatment, including chemotherapy and radiotherapy.
If the number of red blood cells in your blood is low, you may become very tired and feel like you have no energy. You may also become breathless. This is because the red blood cells contain haemoglobin (Hb), which carries oxygen around the body.
You will have a blood test to check your haemoglobin level if you have symptoms of anaemia or are having cancer treatment. This is known as a full blood count (FBC). Your doctors may recommend that you have a blood transfusion if your haemoglobin level is low.