D63: Anaemia in chronic diseases classified elsewhere

Anaemia in chronic diseases classified elsewhere is a condition that occurs when there is a lack of red blood cells in your body due to an ongoing, chronic disease. When the number of red blood cells decrease, your body does not get the amount of oxygen it needs, leading to fatigue and weakness – two of the most common symptoms of anaemia. Other symptoms may include pale skin, shortness of breath, and a fast or irregular heartbeat. The diseases causing this anaemia can vary widely – from more common conditions such as kidney disease or cancer, to less widespread diseases like Crohn’s disease or Rheumatoid arthritis. The anaemia generally develops over time as the chronic disease progresses, affecting the body's ability to produce red blood cells, iron, or vitamin B12. It is not contagious; it is a secondary condition that develops due to potentially untreated or unmanaged chronic diseases.