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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.
This can cause a heart attack, a stroke due to vasospasm of cerebral arteries, or the dislodging of a blood clot that can travel to the brain, causing a stroke. *Blood clotting disorders- can cause an increase in blood clot formation or an increase in bleeding.