Travelling abroad to different climatic conditions and unfamiliar environments can encounter you to a new disease or affect the existing one. You should be aware of the hazards and know how to stay healthy.
Diseases which aren’t present in the Europe such as yellow fever, malaria, rabies and dengue fever are common in some areas of the world.
Make an appointment with your GP at the earliest to check if you need any vaccinations or other preventive measures (such as malaria tablets).
Remember, these treatments aren’t usually available as NHS prescriptions.
Make extra preparations if you have an existing medical conditions like diabetes, hypertension or arthritis asthma etc.
Check out for a Travel Insurance or you could incur a huge medical bill if you fall ill and need hospitalisation.
European Health Insurance Card (EHIC) is available to secure your healthcare needs in the  European countries.
Check the health section of your own country travel advice before you travel.
Drink plenty of water, juices, cold beverages and watery fruits in hot climates to avoid dehydration.
Be protected in the sun - use a high-factor sunscreen and avoid excessive sunbathing between 11am - 3pm.
Note and save the local emergency services numbers and the number of the local hospital
Practice safe sex - take condoms with you as quality varies in different countries. HIV and Aids, and other sexually
      transmitted diseases can be caught worldwide.
In the plane for  Long-distance journeys.
Avoid wearing  tight clothing on long-distance journeys.
Follow regular stretching exercise regime such as flexing and extending your ankles to avoid circulation problems.
Walk round at regular intervals on long flights.
Drink plenty of water on flights and avoid consuming too much alcohol.
Consult your doctor before long-distance travel if you:
are pregnant
have a history of blood disorders, deep vein thrombosis or pulmonary embolism
are taking hormonal medication (including the contraceptive pill)
have cancer, heart problems, have recently had surgery or an immune compromised patient
If you have a pre-existing medical condition:
tell your travel insurer about your ailment.
ask your doctor how the trip might affect you.
check local conditions such as climate and pollution levels and consider how you might be affected.
carry a doctor’s letter and a copy of the prescriptions preferably the drug being taken not the trade name of the
      medicine in your country.
ensure your medication is legal in the country you are visiting – the British Embassy can advise you.
learn key words and phrases in the local language for your condition, medication and emergency help.
Take the same precautions you normally would as in your own country.
if you suffer from a mental illness you should be aware that facilities and local attitudes to mental health problems
      which may differ from those in your home country. It is advices to do some research before you travel.