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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.
Usually, blood flows freely through our veins and arteries. A certain level of blood clotting is normal and necessary to stop us from bleeding when we get injured. However, complications occur when there is too much clotting. There are two different types of blood clots.