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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.
Blood Thinner Doâs and Donâts www.lifescript.com/health/centers/dvt/articles/blood_thinner_dos_and_donts.aspx. have the right dose, so your blood doesn't become too thin or not thin enough,â Dr ... Dehydration causes blood vessels to narrow and blood to thicken, raising the risk for blood clots. ... Dental treatments can cause bleeding, which may last longer if you're taking a blood thinner, the ...