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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.
The blood must first be thinned to expose the pathogens before they can be eradicated. Heavy metal toxicity or exposure to environmental toxins can also activate unusual production levels of soluble fibrin monomer (SFM). Stress and trauma have also been known to cause thick blood.