Skip to content
My WebMD Sign In, Sign Up

Lung Disease & Respiratory Health Center

Font Size

Pulmonary Embolism - What Increases Your Risk

Having a blood clot in the deep vein of your leg and having a previous pulmonary embolism are the two greatest risk factors for pulmonary embolism.

For more information on risk factors for blood clots in the legs, see the topic Deep Vein Thrombosis.

Recommended Related to Lung Disease/Respiratory Problems

Understanding Sarcoidosis -- the Basics

Sarcoidosis is a chronic disease that affects multiple systems in the body, from the eyes to the lungs to the brain. It is characterized by the buildup of immune system cells in organs that form small clusters called granulomas, a type of inflammation of the involved tissues. Sarcoidosis is found throughout the world. While the disease can affect anybody, young women of African descent and people of Scandinavian, German, Irish, or Puerto Rican origin are more prone to sarcoidosis. It occurs...

Read the Understanding Sarcoidosis -- the Basics article > >

Many things increase your risk for a blood clot. These include:

  • Having slowed blood flow, abnormal clotting, and a blood vessel injury.
  • Age. As people get older (especially older than age 70), they are more likely to develop blood clots.
  • Weight. Being overweight increases the risk for developing clots.
  • Not taking anticoagulant medicine as prescribed, unless your doctor tells you to stop taking it.

Slowed blood flow

When blood does not circulate normally, clots are more likely to develop. Reduced circulation may result from:

  • Long-term bed rest, such as if you are confined to bed after an operation, injury, or serious illness.
  • Traveling and sitting for a long time, especially when traveling long distances by airplane.
  • Leg paralysis. When you use your muscles, the muscles contract, and that squeezes the blood vessels in and around the muscles. The squeezing helps the blood move back toward the heart. Paralysis can reduce circulation because the muscles can't contract.

Abnormal clotting

Some people have blood that clots too easily or too quickly. People with this problem are more likely to form larger clots that can break loose and travel to the lungs. Conditions that may cause increased clotting include:

  • Inherited factors. Some people have an inherited tendency to develop blood clots that can lead to pulmonary embolism.
  • Family history of close relatives, such as a sibling, who has had deep vein thrombosis or pulmonary embolism.
  • Cancer and its treatment.
  • Blood vessel diseases, such as varicose veins, heart attack, heart failure, or a stroke.
  • Pregnancy. A woman's risk for developing blood clots increases both during pregnancy and shortly after delivery.
  • Using hormone therapy or birth control pills or patches.
  • Smoking.

Injury to the blood vessel wall

Blood is more likely to clot in veins and arteries shortly after they are injured. Injury to a vein can be caused by:

  • Recent surgery that involved the legs, hips, belly, or brain.
  • A tube (catheter) placed in a large vein of the body (central venous catheter).
  • Damage from an injury, such as a broken hip, serious burn, or serious infection.
1

WebMD Medical Reference from Healthwise

Last Updated: February 05, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Today on WebMD

man coughing
You may not even know you have it.
blood clot
Signs of this potentially fatal complication.
 
man coughing
When a cold becomes bronchitis.
human lungs
Causes behind painful breathing, fluid buildup.
 

Bronchitis Overview
SLIDESHOW
Copd Myth Fact Quiz
QUIZ
 
Living With Copd
VIDEO
Energy Boosting Foods
SLIDESHOW
 

Pollen counts, treatment tips, and more.

It's nothing to sneeze at.

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

cigarette butts snuffed out in ashtray
SLIDESHOW
Healthy Home Health Check
TOOL
 
Senior woman stretching
Article
Diagnosing Copd
VIDEO
 

WebMD Special Sections