Travel clinics are medical facilities that specialize in providing preventive medical care such as vaccinations or altitude sickness medicine to international travellers.

Fear of flying is a fear of being on an airplane or other flying vehicle, such as a helicopter, while in flight. It is also sometimes referred to as aerophobia, aviatophobia or aviophobia.

Fear of flying may be a distinct phobia in itself or it may be an indirect combination of one or more other phobias related to flying, such as claustrophobia (a fear of enclosed spaces) or acrophobia (a fear of heights).
It may have other causes as well, such as agoraphobia (especially the type that has to do with having a panic attack in a place they can't escape from).
Fear of flying is a symptom rather than a disease and different causes may bring it about in different individuals.

The fear of flying receives more attention than many other phobias because air travel is often difficult for people to avoid and because the fear is widespread, affecting a significant minority of the population.
A fear of flying may prevent a person from going on vacations or visiting family and friends, and it can cripple the career of a businessperson by preventing them from traveling on work-related business.

Jet lag (desynchronosis) is a physiological condition caused by alterations to the body's circadian rhythms resulting from rapid long-distance transmeridian (east–west or west–east) travel on a (jet) aircraft. It was previously classified as one of the circadian rhythm sleep disorders.

The condition of jet lag may last several days until one is fully adjusted to the new time zone, and a recovery rate of one day per time zone crossed is a suggested guideline. The issue of jet lag is especially pronounced for airline pilots, crew, and frequent travelers. Airlines have regulations aimed at combating pilot fatigue caused by jet lag.

The common term jet lag is used because before the arrival of passenger jet aircraft, it was generally uncommon to travel far and fast enough to cause jet lag. Propeller flights were slower and of more limited distance than jet flights, and thus did not contribute as widely to the problem.

Motion sickness (kinetosis, travel sickness, seasickness, car sickness, simulation sickness or airsickness) is a condition in which a disagreement exists between visually perceived movement and the vestibular system's sense of movement.

Dizziness, fatigue, and nausea are the most common symptoms of motion sickness