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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.
Since a deep vein thrombosis can be the precursor to serious health hazards, post hospitalization typically involves the use of medications like Warfarin long term and subsequently, a blood coagulation test regularly to monitor the thickness of the blood. Thick blood has many causes, but a sedentary lifestyle and a lack of mobility are some of the most common.