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Can blood thinners cause an aneurysm?

I have a friend who is producing to many red blood cells, causing extremely thick blood.  He is having blood drawn once a month.  He feels fatigued and sometimes nauseated.   When ask about a blood thinner he was told he could not take one as it could cause him to have an aneurysm.  He was given no explanation as to how or why.  Does anyone know the explanation for this?
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