Yes they do. They can even kill you. Basically there are 2 ways by which a bee can kill you. First mechanism is by allergic reactions- Bee sting can trigger a life threatening allergic reaction known as anaphylactic reaction. When a bee stings you, a chemical is released is know as allergen. read more
Attracting the hostile attention of a whole colony of bees leaves you in danger of being stung very many times. The crucial number of stings by honeybees to kill an adult human is something around 1000. Africanized bees are more likely to attack humans in huge numbers. People can outrun bees because their maximum speed is around 3 mph. read more
Unless you have an allergy to bee stings, and as long as you are not attacking a bee or their nest, bumblebees are harmless to humans, they are a charming and fascinating garden visitor, vital to the survival of many plant species, cherish them. read more