Anaemia is characterised by a reduced number of red blood cells in the bloodstream. Common forms of anaemia are caused by nutritional deficiencies such as iron deficiency anaemia, but there are many other causes of the condition.
As red blood cells transport oxygen in the blood via haemoglobin, a reduction in their number can cause symptoms such as fatigue and pale skin. Symptoms can indicate the exact cause of anaemia, along with the shape, size and amount of nuclear material in the erythrocyte.
Please see below for a brief summary of several types of anaemia.