Sitting still for long periods of time in cramped conditions, such as on an aeroplane, increases the risk of a blood clot forming in a leg vein €“ called deep vein thrombosis (DVT). The affected leg may become painful, tender and swell up.

DVT can be dangerous if part of the clot breaks off and travels to the lungs or another part of the body. The risk increases if the traveller is pregnant, has recently given birth, is taking the contraceptive pill or is following a course of hormone replacement therapy. Those with a history of DVT, limited mobility or obesity are more vulnerable.

Sitting for long periods of time, such as on an aeroplane, increases the risk of DVT

Customers can reduce their risk of developing DVT by wearing compression socks, which squeeze blood up the legs and back to the heart. Compression socks should be put on first thing in the morning before any swelling has occurred. Example: Scholl Flight Socks.

In addition, customers should be advised to exercise their legs and rotate their ankles regularly, avoid alcohol and drinks that contain caffeine, and keep hydrated by drinking water.