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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.
Abnormal blood clotting: Anything that interferes with blood clotting can lead to nosebleeds. Medications, even common ones like aspirin, can alter the blood-clotting mechanism just enough to cause bleeding. Blood diseases, such as hemophilia, also can provoke nosebleeds.