Have plenty to drink! Avoid dehydrants like coffee and alcohol. Down on the ground, humidity in houses is usually between 40-60%, but up in the air it can be as low as 10%. The dry air means that we dehydrate if we don’t drink enough. When we are dehydrated, our blood becomes more concentrated and the risk for clots increases. Symptoms of jet lag also increase over several time zones.
If you are over 50, pregnant, overweight, a smoker, a hormone user, have a heart condition, have a chronic illness or have had deep vein thrombosis in the past, you should wear special support stockings, made for long flights.