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People who sit or cross their legs for extended periods are being advised to avoid this habit as much as possible. The organisation Stop The Clot warns that whether you're in your house or out and about, crossing your legs can restrict proper blood flow in your legs.

They emphasise that maintaining healthy circulation is key to preventing blood clots. They also note that people who have previously experienced Deep Vein Thrombosis (DVT) are at a higher risk of developing it again than those who have never had the condition.

But regardless of whether or not you've had it, the experts warn that you should not sit for too long and if possible, try to get up and walk around every two hours. Even when you're sitting, you should aim to do heel toe exercises and circle your feet.

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The group said: "Exercise increases circulation, reduces swelling, and helps you feel invigorated. Aerobic exercise may increase lung function after a PE (pulmonary embolism)."

What are the signs and symptoms of a DVT?

• Swelling, usually in one leg
• Leg pain or tenderness
• Reddish or bluish skin discoloration
• Leg warm to touch

If you’re experiencing swelling, it’s normal for it to persist in the leg for some time. Wearing compression stockings can help boost blood circulation, reduce swelling, and lower the risk of complications related to DVT.

What are the warning signs of a pulmonary embolism (PE or blood clot in the lung)?

• Sudden shortness of breath
• Chest pain that is sharp or stabbing and may get worse with each breath
• Rapid heart rate
• Unexplained cough, sometimes with bloody mucus
• A PE is a medical emergency and you should seek medical attention right away

What should I expect after a pulmonary embolism (PE)?

Stop The Clot advises that experiencing shortness of breath and mild chest pain or pressure is common. These symptoms are usually not cause for concern, so try not to worry.

You may also have pain "when you exert yourself or during physical activity or whenever you take a deep breath. Shortness of breath gets better in time, and exercise helps you use your breath more efficiently."

What is the risk of DVT?

The level of increased risk varies based on a person's medical history and includes factors like:

• family history of blood clots
• the location of the clot
• any prior clots or clotting disorders
• specific “triggers, such as hospitalisation lasting more than three days, surgery, knee or hip replacement, and significant trauma"

How to prevent blood clots

To reduce the risk as much as possible, try to take regular breaks, especially during long car journeys. You can do this by stopping every hour to get out and walk around for a few minutes.

If you're flying or travelling by train or bus, opt for a seat with extra legroom, if you can like an aisle or exit row. You should also make an effort to walk up and down the aisle when it’s safe to do so.

If you can't get out into the aisle, try heel toe exercises and foot circles while seated to keep your blood flowing. The organisation concludes: "It is also a good idea to wear compression stockings consistently if you have had a DVT, and this includes while travelling.

"Wear loose fitted clothing, and drink a lot of water. Sometimes your doctor will suggest a dose of a low molecular weight heparin prior to lengthy travel."

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