Although many different types of insects in the United States are able to inflict a poisonous bite or sting (meaning they are venomous), the insects most likely to cause medical problems are bees (including the domestic honey bee, its Africanized "killer bee" race, and the bumble bee), wasps (including paper wasps, hornets, and yellow jackets), and ants (including the fire ant). These insects are all in the Hymenoptera family, and thus stings from them are occasionally called Hymenoptera stings.
Because many of these species live in colonies, if one stings you, you may be stung by many. Although most stings cause only minor medical problems, some stings may cause serious medical problems and even death. Read more about bee, wasp, hornet, and yellow jacket stings.