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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.
A. Yes, it is possible to thin the blood too much, but generally it is difficult to thin the blood excessively to the point of medical harm by supplements alone - for instance without aspirin or coumadin - but it can happen in rare cases. Bruising treatment, vitamin. Therapy depends on the cause.