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Common Risk Factors for Developing Blood Clots

Understanding your risk

Some people are more likely to develop a blood clot than others. Having one or more risk factors does not mean you will develop a clot, but it does increase your chances. Knowing your personal risk can help you and your health-care team take steps to reduce it.

People at higher risk

You may be at higher risk of developing a blood clot if you have one or more of the following:

Decreased mobility

Reduced movement from being on bed rest, recovering in hospital, or sitting/lying still for extended periods (including travel via plane or vehicle) slows circulation in the legs and can allow clots to form more easily.

Recent surgery or injury

Surgical procedures can temporarily affect blood flow and reduce movement while the body is healing. These changes make it easier for clots to form during recovery.
Serious injuries such as fractures, muscle tears, or deep bruises can damage blood vessels and limit mobility, which may allow clots to develop as the body repairs itself

Medical conditions

Certain cancers and treatments (such as chemotherapy, radiation, or hormone therapy) can increase risks that make blood more likely to clot
Increased BMI: Weight can affect circulation and is connected to changes in blood clotting, which may contribute to the formation of blood clots.
Hormones changes, including hormone replacement therapy, use of birth control pills or pregnancy/menopause can increase the likelihood of clot formation. Watch the following video from Thrombosis Canada to learn more about how hormone changes increase your risk of blood clots:

Lifestyle factors

Smoking: Chemicals in tobacco damage blood vessels, reduce oxygen delivery, and impacts how the body creates blood clots
Low physical activity: A sedentary lifestyle can contribute to poor circulation and can contribute to higher clot risk over time

Age and family history

Age over 60: Age can contribute to changes in the veins, such as weakening of vein valves, and health conditions that are more common with age. Together, these factors can make clots more common after 60.
Family history of blood clots: Inherited clotting disorders or a close relative with a history of blood clots may increase personal risk

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