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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.
sudden unexplained bruising or blood spots under the skin or a sudden increase in the frequency of bruising may be caused by a medicine such as aspirin or blood thinners anticoagulants infection that causes the buildup of toxin in the blood or tissues sepsis a bleeding or clotting disorder such as hemophilia von willebrand s disease thrombocytopenia or another less common bleeding or clotting disorder