Blood disease, any disease of the blood, involving the red blood cells (erythrocytes), white blood cells (leukocytes), or platelets (thrombocytes) or the tissues in which these elements are formed—the bone marrow, lymph nodes, and spleen—or of bleeding and blood clotting.
Blood diseases and disorders affect one or more parts of the blood and prevent your blood from doing its job. Many blood diseases and disorders are caused by genes. Other causes include other diseases, side effects of medicines, and a lack of certain nutrients in your diet.
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