Long air journeys have their own health hazards, such as dehydration. For some, inactivity and cramped seating for long periods can increase the risk of a blood clot in the leg.
यदि थक्का वहाँ से हटकर फेफड़े या दिल तक पहुँच जाए तो ज़्यादा ही खतरनाक नतीजे हो सकते हैं ।