Why are blood clots dangerous?

Arash M. Padidar, MD
Vascular & Interventional Radiology
Blood clots can prevent the flow of blood to the heart and have severe effects, says Arash Padidar, MD, of Regional Medical Center of San Jose. Learn more in this video.
Dr. Michael Roizen, MD
Internal Medicine
The fact that blood can clot is a very good thing. Clotting is what stops us from bleeding excessively when we get injured. But as you age, you can develop blood clots where you don't want them -- namely, on the walls of the arteries. And fat eventually builds in the walls of the arteries, slowing the flow of blood and causing platelet pileups -- blood vessel traffic jams -- that slow the flow of blood even more. These platelet pileups can form small clots in the arteries. If a clot gets too big, it can fill the entire artery, and blood can't get through at all, causing the tissue supplied by that artery to be at risk of dying. The heart has to work harder to push the blood to where it's supposed to go, increasing blood pressure and stressing the arteries even more. Indeed, just as a major traffic jam can affect a whole city, cardiovascular disease can stress your whole body.
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Why not live at 60 feeling like you did at 35?Thousands of Americans are younger today than they were five years ago. How is that possible? By following the specific recommendations that reverse...
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Every cell in your body needs oxygen to function. Blood clots can slow or halt the flow of blood containing oxygen through a blood vessel. Watch this animation to see how blood clotting happens.


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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.