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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.
Blood clots may also break away from their original source and cause damage elsewhere in your body. Blood clots that break away from a deep vein thrombosis and travel to your lungs may cause a potentially life-threatening blood clot in the lungs (pulmonary embolism).lood clots that arise in the arteries of the heart itself may block the flow of blood through that artery and cause a heart attack. Blood clots that arise from within the carotid arteries in your neck may travel to the brain and cause a stroke.