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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.
In rare cases, your body may begin to produce too much IgM. When this happens, your blood will become thicker (a symptom known as âhyperviscosityâ), making it difficult for all of your organs and tissues to function properly. This condition is known as WaldenstroemâwaldenstrÃ¶m s. disease