If you are travelling within the EU, be sure to get a EHIC (European Health Insurance Card). This entitles you to emergency medical treatment if required. The EHIC is also valid in other European countries such as Switzerland. See http://oasis.gov.ie/moving_country/moving_abroad/e111.html  for a complete list of countries and more information. Note that the EHIC does not guarantee free medical care in all countries. The EHIC is available from your local health centre.