There are few serious health risks in Finland. Your primary enemy especially in wintertime will be the cold, particularly if trekking in Lapland. Finland is a sparsely populated country and, if heading out into the wilderness, it is imperative that you register your travel plans with somebody who can inform rescue services if you fail to return. Always keep your mobile phone with you if you run into trouble. Dress warmly in layers and bring along a good pair of sunglasses to prevent snow blindness, especially in the spring and if you plan to spend whole days outdoors. Always keep a map, a compass and preferably a GPS with you while trekking in the wilderness. Take extra precautions in Lapland, where it can be several days' hike to the nearest house or road. Weather can change rapidly, and even though the sun is shining now, you can have a medium sized blizzard on your hands (no joke!) an hour or two later.
If out on the lakes and sea, remember that wind and water will cool you faster than cold air, and keeping dry means keeping warm. A person that falls into cold water (close to zero C) can die in a few minutes. Safety in small boats: Don't drink alcohol, wear a life vest at all times, if your boat capsizes - keep clothes on to stay warm, cling to the boat if possible (swim only if shore is a few hundred meters away, never try to swim in cold water below 20°C).
Finland hosts a number of irritating insects, but if you are planning to stay in the centres of major cities, you are unlikely to encounter them. A serious nuisance in summer are mosquitoes (hyttynen), hordes of which inhabit Finland (particularly Lapland) in summer, especially after rains. While they carry no malaria or other nasty diseases, many species of Finnish mosquitoes make a distinctive (and highly irritating) whining sound while tracking their prey, and their bites are very itchy. As usual, mosquitoes are most active around dawn and sunset — which, in the land of the Midnight Sun, may mean most of the night in summer. There are many different types of mosquito repellants available which can be bought from almost any shop. Another summer nuisance are gadflies (paarma), whose bites can leave a mark lasting for days, even for month. A more recent introduction to Finnish summers are deer keds (hirvikärpänen), that can be particularly nasty if they manage to shed their wings and burrow into hair (although they rarely bite as humans are not their intended targets, and mainly exist in deep forests). Use repellent, ensure your tent has good mosquito netting and consider prophylaxis with cetirizine (brand names include Zyrtec), an anti-allergen that (if taken in advance!) will neutralize your reaction to any bites. Topical anti-allergens in the form of gels and creams are also available as over-the-counter medication. A flea comb can be useful for removing deer keds.
In southern Finland, especially Åland, the Lappeenranta-Parikkala-Imatra-axis and areas near Turku's coast, there are ticks (punkki) which appear on summertime and can transmit Lyme's disease (borreliosis) and viral encephalitis through a bite. Although these incidents are relatively rare and not all ticks carry the disease, it's advisable to wear dark trousers rather than shorts if you plan to walk through dense and/or tall grass areas (the usual habitat for ticks). You can buy special tick tweezers from the pharmacy (punkkipihdit) which can be used to remove a tick safely if you happen to get bitten. You should remove the tick from your skin as quickly as possible and preferably with the tick tweezers to reduce the risks of getting an infection. If the tick bite starts to form red rings on the skin around it or if you experience other symptoms relating to the bite, you should visit a doctor as soon as possible.
The only poisonous insects in Finland are wasps (ampiainen), bees (mehiläinen) and bumblebees (kimalainen). Their stings can be painful, but are not dangerous, unless you receive several stings or if you are allergic to it.
There's only one type of poisonous snake in Finland, the European adder (kyy or kyykäärme), which has a distinct zig-zag type of figure on its back, although some of them are almost completely black. The snake occurs across Finland all the way from the south to up north in Lapland. Although their bites are extremely rarely fatal (except for small children and allergic persons), one should be careful in the summertime especially when walking in the forests or on open fields at the countryside. Walk so that you make the ground vibrate and snakes will go away, they attack people only when somebody frightens them. If you are bitten by a snake, always get medical assistance. If you are planning to travel in the nature on summertime, it's advisable to buy a kyypakkaus ("Adder pack", a medicine set which contains a couple of hydrocortisone pills). It can be bought from any Finnish pharmacy. It is used to reduce the reactions after an adder bite, however it's still advisable to see a doctor even after you've taken the hydrocortisone pills. The kyypakkaus can also be used to relieve the pain, swelling and other allergic reactions caused by bee stings. If you see an ant nest, ants have quite likely taken care of all snakes nearby.
As for other dangerous wildlife, there's not much more than a few extremely rare encounters with brown bears (karhu) and wolves (susi) in the wilderness. Both of these animals are listed as endangered species. Contrary to popular belief abroad, there are no polar bears in Finland, let alone polar bears walking on the city streets. The brown bear, which occurs across Finland has been spotted on a few very exceptional occasions even in the edges of the largest Finnish cities, but normally bears try to avoid humans whenever possible. The brown bear hibernates during the winter. In the least densely populated areas near the Russian border, there has been some rare incidents of wolf attacks - mainly lone, hungry wolves attacking domestic animals and pets. During the past 100 years there has been one recorded case of a human killed by a large predator. In general, there's no need to worry about dangerous encounters with wild beasts in Finland.
Finland enjoys a comparatively low crime rate and is, generally, a very safe place to travel. Use common sense at night, particularly on Friday and Saturday when the youth of Finland hit the streets to get drunk and in some unfortunate cases look for trouble. It is statistically more likely that your home country is less safe than Finland, so heed whatever warnings you would do in your own country and you will have no worries. If you yourself run in with the law, remember that Finland is one of the world's least corrupt countries and you will not be able to buy yourself out of trouble.
Racism is a generally of minor concern, especially in the cosmopolitan major cities, but there have been a few rare but highly publicized incidents of black or Arab people getting beaten up by gangs. The average visitor, though, is highly unlikely to encounter any problems.
Pickpockets are rare, but not unheard of, especially in the busy tourist months in the summer. Most Finns carry their wallets in their pockets or purses and feel quite safe while doing it. Parents often leave their sleeping babies in a baby carriage on the street while visiting a shop, and in the countryside cars and house doors are often left unlocked. On the other hand, you have to be careful if you buy or rent a bicycle. Bicycle thieves are everywhere, never leave your bike unlocked even for a minute.
In case of emergency
112 is the national phone number for all emergency services, including police, and it does not require an area code, regardless of what kind of phone you're using. The number works on any mobile phone, whether it is keylocked or not, and with or without a SIM card. If a cellphone challenges you with a PIN code, you can simply type in 112 as a PIN code - most phones will give a choice to call the number.
For inquiries about poisons or toxins (from mushrooms, plants, medicine or other chemicals) call the national Toxin Information Office at (09) 471 977.