An allergy is a condition in which the immune system reacts abnormally to a foreign substance. There are different types of allergies such as food allergies, or seasonal allergies. All of them are different, and each have different syptoms. Symtoms can also vary from the severity of the allergy. Usually allergies are rated on a scale from 1 to 6. Being a 1, can mean that one could get a mild stomach ache or a rash or itch. A 6 can mean that a person could go into anaphylactic shock, and eventually die if not attended to. Allergies can be retained at birth or could surface later on in one's life. Allergies can also be hereditary, meaning that a parent with a type of allergy could have a higher chance to pass on that allergy or something similar to it. In order to counteract allergies, types of medicines have been made, such as EpiPens, that can help stop the allergy. New ways are still being developed to comepletely counter allergies, such as slowly introducing small amounts of the substance to the body. Allergies are a huge threat to all systems of the body and new ways to treat and prevent allergies are being found every day.