Travel can be stressful, physically, mentally and emotionally. You're constantly moving, and being exposed to new foods and diseases, which puts stress on your body. Your mind is being exercised as well, as you plan your trip and deal with challenges as they arrive - maybe you have to speak a new language, or alter your plans at the last minute. All of these stressors will have an impact on your emotional health, which is subject to its own problems - after all, you have to interact with people, which can be tough on your emotions.
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