This is the main cause of anaemia in infections. The micro-organism responsible for the infection has a deleterious eﬀect upon the blood-forming organs, just as it does upon other parts of the body.
Toxins. In conditions such as chronic glomerulonephritis (see KIDNEYS, DISEASES OF) and URAEMIA there is a severe anaemia due to the eﬀect of the disease upon blood formation.
Drugs. Certain drugs, such as aspirin and the non-steroidal anti-inﬂammatory drugs, may cause occult gastrointestinal bleeding.