Travelers have to face unfamiliar environments that can pose serious risks for their health, depending on the mode of transportation, destination, duration and season of travel, purpose of travel, standards of accommodation, food hygiene and sanitation, behavior of the traveler, and finally the underlying health of the traveler. Most major cities and tourist centers offering services of a high standard pose relatively few serious health risks compared to remote areas, where stringent precautions must be taken to avoid illness.

A common complaint for travelers is motion sickness, resulting from the sensory conflict arising in the brain from differing sensory inputs. Typical symptoms such as nausea, vomiting, dizziness, or sweating can develop from the movement of a car, from turbulence in an airplane, or from sea travel. ...

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