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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.
Some Possible Effects of Blood Clots Include: 1  Stroke - A stroke can occur if a blood clot causes blood flow to your brain to be restricted.  Heart Attack - A blood clot in a coronary artery can lead to a heart attack.