Travel in Finland presents very few health problems. The standard of care is extremely high and English is widely spoken by doctors and medical clinic staff, tap water is safe to drink, the level of hygiene is high and there are no endemic diseases.
The main health issues to be aware of are extreme climates (with the potential for nasties like hypothermia, frostbite or viral infections such as influenza) and biting insects such as horseflies and mosquitoes, though they’re more of an annoyance than a real health risk.
Specific travel vaccinations are not required for visitors to Finland.
Citizens of the European Economic Area (EEA) are covered for emergency medical treatment on presentation of a European Health Insurance Card (EHIC), though they will be liable to pay a daily or per-appointment fee as a Finn would; see www.kela.fi for details. Enquire about EHICs at your health centre, travel agency or (in some countries) post office well in advance of travel. Citizens from other countries should find out if there is a reciprocal arrangement for free medical care between their country and Finland. If not, health insurance is recommended.