Corlu is a good place to get private medical care. There is a very reasonable, highly professional private hospital on Ataturk Boulevard, on the left as you come from Istanbul. A range of cheap check ups is available for around 5 euros each, and there is, conveniently, a good-value 3 star hotel next door. Given Corlu's compact size and relative lack of traffic, this is a good place to recuperate after hard travelling around the region, and get minor ailments fixed before moving on.
Tap water is never drinkable, so it is best to buy bottled or demijohn water.
The air especially in winters is very polluted. Actually, the air of Ãorlu is one of the most polluted in the country.