If you get stung by a cicada killer, the pain may be intense, but it is unlikely to be life-threatening. Cicada killers are solitary wasps that are not aggressive toward humans, and they only sting when they feel threatened or cornered. The sting of a cicada killer can cause redness, swelling, and itching at the site of the sting, which may last for a few days. In rare cases, some people may experience an allergic reaction to the venom, which can cause symptoms such as difficulty breathing, hives, and swelling of the face and throat. If you are allergic to insect stings, it is important to seek medical attention immediately if you are stung by a cicada killer or any other insect.