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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.
Typically, your body breaks down the clot. However, sometimes blood clots form too easily or do not dissolve properly. This excessive clotting -- hypercoagulation -- also causes thick blood. This can be dangerous since clots can form inside your blood vessels and block blood flow to tissues or organs.