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The extra red blood cells make your blood thicker than normal. As a result, blood clots can form more easily. These clots can block blood flow through your arteries and veins, which can cause a heart attack or stroke. Thicker blood also doesn't flow as quickly to your body as normal blood.
Understand the Term. Thick blood is known in the medical community as hypercoagulability. As its name indicates, this condition causes blood to clot much more easily than usual because it is thicker and stickier. Normally, a combination of proteins within blood prevent it from clotting in the vessels.