What are the main risk factors for a DVT?

Sometimes a DBT occurs for no apparent reason. However, the following increases your risk of having a DBT. Immobility, which causes the blood flow in veins to be slow. Slow flowing blood is more likely to clot than normal flowing blood. So examples of immobility include particularly after surgery, or any illness or injury that causes immobility. Additionally, long journeys by car or plane can cause you to sit for long periods of time which may increase your risk of developing a DVT as well. Another risk factor is damage to the inside of the lining or cause is damage to the inside of the lining of the vein, which increases the risk of blood clot forming. So, for example, if you've had a previous DVT, that can damage the inside lining of your vein which can predispose you to developing a new one in the future. Other conditions and causes include inflammation of the vessel wall and some medicines including chemotherapy and injury to the vein caused by a needle. Other things that can increase your risk of DBT formation are conditions that make your blood more likely to clot than normal, for example thrombophilia. Contraceptive pills, patches and rings can also increase your risk, as well as people with cancer or heart failure. Sometimes you can develop a DVT in someone who's not yet developed or been diagnosed with cancer and it could be a sign that something else is going on. Older people are also more likely to develop a DVT, as well as pregnant people and obesity as well as another risk factor.