What is pernicious anaemia?
Pernicious anaemia is an autoimmune condition where your immune system mistakenly attacks cells in your stomach. These cells are responsible for producing a protein called intrinsic factor — helps your body absorb vitamin B12.
If you’re not producing enough intrinsic factor, your body can’t absorb vitamin B12 and it leads to a deficiency. This means your body can’t make enough red blood cells or each blood cell doesn’t have enough haemoglobin — anaemia.
Pernicious anaemia is the most common cause of vitamin B12 deficiency in the UK.