If you have a chronic health problem, the Lancet authors suggest a preflight medical assessment to determine whether it is safe for you to fly and what precautions you should take if you do fly.

• 如果你有某种慢性病,瑟伦塞特网站的作者建议做一个飞行前的医学评估,决定飞行对你是否安全以及如果你确实需要飞行应当采取什么预防措施。