Long flights and leg clots: simple prevention

Move, hydrate and know the warning signs — practical advice before your next trip.

Sitting still for more than four hours slows blood flow in the leg veins. For most travellers the risk is small, and a few habits reduce it further: walk the aisle every hour, flex your ankles while seated, drink water and limit alcohol.

If you have had a clot before, recent surgery, or are pregnant, ask about compression stockings or medication before you travel.

Seek care promptly if one leg becomes swollen, warm and painful, or if you feel sudden breathlessness or chest pain.