Insect stings
People who are allergic to stings can have a severe or even life-threatening reaction. Symptoms include severe swelling and redness from the sting or bite that may last a week or more, nausea, fatigue, and low-grade fever. In rare cases when insect bites cause a severe reaction (anaphylaxis), symptoms may include difficulty breathing, swelling around the face, throat, or mouth, racing pulse, an itchy rash or hives, dizziness, or a sharp drop in blood pressure. If you're severely allergic, you should get epinephrine immediately after a sting. Allergy shots are recommended to prevent anaphylaxis for some stings.