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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.
Do you mean, why should you avoid aspirin or ibuprofen while taking blood thinners? If yes, I think that aspirin and ibuprofen have a similar effect on the blood. Taking â¦ both could cause the blood to become too thin and to not clot when it's necessary, like when there's been an accident. I am not a doctor or nurse, but I do have some other training (personal care aide). Also, a close relative and a former client of mine have been on blood thinners before.