Naturally Become Allergy-Free! Allergies are known as immune malfunctions that develop when one's body is oversensitive to a particular substance. These substances that result in allergies are know as allergens. Allergies make the body produce abundant amounts of immunoglobulion E. Unreasonable amounts could cause inflammation, itchy eyes, runny noses or could even result in shock or death, depending on how extreme one's allergies may be.