This category contains articles that deal with diseases of the blood and blood-forming organs. The study of those diseases is known as Hematology. Hematology includes the study of etiology, diagnosis, treatment, prognosis, and prevention of blood diseases.

Blood diseases affect the production of blood and its components, such as blood cells, hemoglobin, blood proteins, the mechanism of coagulation, etc.

An immune system is a collection of mechanisms within an organism that protects against disease by identifying and killing pathogens and tumor cells. It detects a wide variety of agents, from viruses to parasitic worms, and needs to distinguish them from the organism's own healthy cells and tissues in order to function properly. Detection is complicated as pathogens adapt and evolve new ways to successfully infect the host organism.

A partial list of the various diseases under this category are listed as follows:

• Nutritional anaemias.

• Haemolytic (breakdown of red blood cells) anaemias.

• Aplastic (bone marrow deficiency) and other anaemias.

• Coagulation defects, purpura (bleeding below the skin) and other haemorrhagic conditions.

• Other diseases of the blood and blood-forming organs.

• Certain disorders involving the immune mechanism.

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