Air travel is an essential part of modern life, whether for holidays, work, or visiting family. However, long periods of immobility during flights can increase the risk of developing Deep Vein Thrombosis (DVT)—a condition where a blood clot forms in a deep vein, most commonly in the leg. While DVT is relatively uncommon, it is important to understand how it occurs, who is at risk, and when to seek reassurance.
Why flying increases the risk of DVT
DVT develops when blood flow in the veins becomes sluggish, allowing a clot to form. During long flights, particularly those lasting more than four hours, passengers often remain seated for extended periods with limited leg movement. This reduced circulation, combined with dehydration and restricted space, creates an environment where clots are more likely to develop. In some cases, part of the clot can break away and travel to the lungs, causing a pulmonary embolism, which is a serious medical emergency.
Certain individuals are more vulnerable to developing DVT. This includes people who are pregnant or recently postnatal, those taking hormonal contraception or hormone replacement therapy, and individuals with a previous history of blood clots. Additional risk factors include recent surgery, reduced mobility, obesity, smoking, and certain long-term medical conditions. Even in otherwise healthy individuals, prolonged immobility during travel can still pose a risk.
Symptoms
The symptoms of DVT can vary and may not always be obvious. Many people experience swelling in one leg, often accompanied by pain or tenderness in the calf, a feeling of warmth, or skin that appears slightly red or discoloured. Some describe a sensation of heaviness or tightness in the leg. Because these symptoms can be subtle, they are sometimes overlooked. However, any sudden symptoms—particularly after travel—should always be taken seriously.
Why Ultrasound?
An ultrasound scan of the leg is the most effective and reliable way to assess for DVT. This type of scan is non-invasive, painless, and does not involve radiation, making it a safe and reassuring investigation. Using real-time imaging, the sonographer can assess blood flow within the veins and identify whether a clot is present. The scan typically takes around 15–20 minutes and provides immediate information that can guide further care if needed.
There are many benefits to having a leg ultrasound scan, particularly if you are concerned about symptoms following a flight. It offers rapid reassurance, allowing you to either rule out a clot or identify it early, when treatment is most effective. Early detection is key in preventing complications, and for many patients, simply having clarity about their symptoms brings significant peace of mind.
If you have recently travelled on a long-haul flight and notice any unusual leg symptoms, it is sensible to seek assessment. Even if symptoms are mild, a scan can provide reassurance. Some patients also choose to have a scan if they fall into a higher-risk group and want to be proactive about their health, especially if they travel frequently.
Reducing Your Risk
While the risk of DVT cannot be eliminated entirely, there are simple steps that can help reduce it when flying. Staying well hydrated, moving regularly throughout the flight, and performing gentle leg exercises while seated can all support healthy circulation. Avoiding tight clothing and not crossing your legs for long periods can also help. For those at higher risk, medical advice may include the use of compression stockings.
At Serenity Ultrasound, we understand that symptoms like leg pain or swelling can be worrying, particularly after travel. Our clinic provides a calm, professional, and CQC-regulated environment, where you can access prompt, high-quality ultrasound scans performed by experienced sonographers. We offer same-day and urgent appointments, ensuring you are not left waiting for answers when reassurance is needed most.
If you are concerned about DVT or would like peace of mind following a flight, booking a leg ultrasound scan is a simple and effective step towards protecting your health.