Hypoxia

氧不足

Hypoxia is a condition in which the body’s tissues are deprived of oxygen, a very mild form of which can occur during flight and leave the traveller with a headache, feeling dizzy, or unable to focus. With air pressure in the cabin similar to what you’d expect to find at 8,000 feet above sea level, your lungs have to work much harder to take in the same amount of oxygen, contributing to the headaches and dizziness that many people feel.

氧不足就是身体组织内部缺氧，坐飞机的时候我们的身体会轻微缺氧，进而导致头痛，眩晕或注意力不集中。机舱中大气压强度和海拔8000英尺的大气压一样，要想吸入和平时一样的氧气，你的肺需要比以往更大强度的工作，由此而导致了头疼眩晕。

Ankle swelling¹ and deep vein² thrombosis

踝关节肿胀和深静脉血栓

Sitting still for extended periods of time has long been associated with Deep Vein Thrombosis (DVT), which kills thousands of people every year. The condition occurs when blood clots³ develop within the deep veins⁴ of the legs, causing pain and swelling. Long periods of immobility in cramped⁵ spaces, low cabin pressure and dehydration⁶ can all contribute towards the likelihood of a passenger getting DVT.

长时间静坐长期以来都被认为会导致深静脉血栓(DVT)，每年有上千人死于这种疾病。这种现象是由腿部深静脉血液结块导致的，随后会感到疼痛和肿胀。在狭窄的空间长期坐着不动，低舱压和缺水都可能会导致乘客得DVT。

Hearing loss

损伤听力

Many of us are accustomed to the roar of an aircraft, even from inside the cabin. Sounds can often range between 95 and 105 decibels⁷, rising to 115 during take-off – which can potentially lead to hearing loss, especially if you fly a lot.

我们大多数人已经习惯了飞机的轰鸣，即便是就坐在机舱里。此声音常常可以达到95到105分贝，起飞时甚至可以达到115分贝——这极有可能导致听力损伤，尤其是对于常常坐飞机的人来说。

Illnesses

疾病

Aircraft cabins are a ripe breeding ground for viruses. A study published in 2004 revealed that the chance of developing the common cold is over 100 times greater on a flight than on ground level.

飞机机舱是病毒繁殖的温床。2004年发表的一项研究表明，在飞机上得普通感冒的概率是地面上的100倍。

Motion sickness

晕动病(晕机)

Motion sickness can leave you looking pale, feeling dizzy and even nauseous. It is caused by a difference between what your eyes see and what your inner ears -which are responsible for balance - feel. Your inner ears think you are sitting still but your eyes know you’re travelling at 500mph or that the aircraft is tilting⁸.

晕动病会导致你面色苍白，感觉眩晕甚至恶心呕吐。这是由于你的眼睛看到的和内耳(感知平衡的部位)感到的存在差异。你的内耳认为你在静静地坐着，但你的眼睛看到的却是你在以500英里每小时的速度飞行或是飞机正在斜飞。