December 31st, 2012
12:56 PM ET

Blood clots: 4 things you need to know

Secretary of State Hilary Clinton was hospitalized Sunday for a blood clot that formed after her she fell and suffered a concussion a few weeks ago.

The clot was discovered during a follow-up exam related to the concussion, said Clinton's spokesman, Philippe Reines, deputy assistant secretary of state. Clinton, 65, was expected to remain at New York Presbyterian Hospital for the next 48 hours for monitoring and treatment with anticoagulants - drugs that prevent clots from forming or prevent them from growing larger.

Reines said Clinton's clot was found in the vein located in the space between the brain and the skull behind the right ear. "It did not result in a stroke, or neurological damage. To help dissolve this clot, her medical team began treating the Secretary with blood thinners," said Clinton's doctors in a written statement.

Blood clots most often develop deep in leg veins, and symptoms are easily missed. The medical term for blood clots developing in the large veins of the leg or pelvis is deep vein thrombosis (DVT). An estimated 2 million Americans develop DVT each year.  

Here are four things you need to know about blood clots:

1. DVT is not life-threatening (most of the time)

Most cases of DVT are simply treated with a blood thinner that breaks up the clot and prevents it from migrating to different areas in the body. However, if left untreated, DVT can result in a pulmonary embolism, which occurs when the blood clot travels from the leg to the lungs. It accounts for nearly 200,000 deaths a year.

2. Travelers have the highest risk 

A large long-term study published in the journal PLoS One in 2007 found the more frequently a person travels, the higher their risk. This is because blood clots are generally caused by sluggish blood flow through the vein, usually from sitting in cramped positions for long periods of time. Experts say most cases of DVT develop on flights over four hours in length. Some studies show the cabin pressure of an airplane also plays a role. Most people think DVT strikes just older adults, but research shows that women taking birth control pills, people over 6 feet 1 inch tall, and adults under 30 are at increased risk.

3. There are warning signs

If your leg, ankle or foot is swelling, cramping or feel warm to the touch, that may be a sign of a DVT blood clot. Also, sudden onset of shortness of breath, anxiety or chest pain may be a warning of pulmonary embolism, or a blockage in a lung.

4. Keep the blood flowing

The most important thing you can do to reduce your risk of developing a blood clot is to get up and walk around every 30 to 45 minutes to keep the blood flowing in your legs. If you are stuck at your desk at work, or on an airplane and can't get up, simply pumping your leg/foot or rotating your ankle can help to get the blood moving. Staying hydrated is also essential. Alcohol and anything with caffeine can add to dehydration and up your risk of developing a blood clot.

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Get a behind-the-scenes look at the latest stories from CNN Chief Medical Correspondent, Dr. Sanjay Gupta, Senior Medical Correspondent Elizabeth Cohen and the CNN Medical Unit producers. They'll share news and views on health and medical trends - info that will help you take better care of yourself and the people you love.