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Blood disorders can affect any of the three main components of blood: 1  Red blood cells, which carry oxygen to the body's tissues. 2  White blood cells, which fight infections. 3  Platelets, which help blood to clot.
1 Platelet disorders, excessive clotting, and bleeding problems, which affect how your blood clots. 2  Anemia, which happens when your blood does not carry enough oxygen to the rest of your body.  Cancers of the blood, such as leukemia and myeloma.