👉 In medicine, anaphylaxis is a severe allergic reaction that can occur when the immune system mistakenly attacks the body's own cells. The symptoms of anaphylaxis are sudden and intense swelling of the face, throat, and lips (also known as hives), difficulty breathing, itching, swelling of the tongue, and sometimes a fast heartbeat. It is often caused by a substance called anaphylactagogue, which is a protein that your immune system mistakenly perceives as a threat,
