A person who has allergies has them because his or her body over reacts to a material that would otherwise be ignored. It is an overreaction of the immune system triggering a immune attack response that is unneeded. For instance, A person with a peanut allergy has a body whose immune system flags the peanut protein as an intruder and attacks it. It produces antibodies and causes growning reactions that can be life threatening and cause anaphylaxis.
