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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.
Quick Answer. People whose blood is too thin are prone to excessive bleeding that is potentially dangerous. Those with thin blood lack sufficient platelets, which are cell fragments that help the blood form clots. Health Guidance reports these people tend to experience nose bleeds, bleeding gums, frequent bruising all over their bodies and even blood in their urine. Continue Reading