People who suffer from allergies of a specific type are usually prone to allergies from various other substances. These substances, called allergens, range from common indoor household substances like dust particles, mold and mildew, pet dander, chemical emissions from cleaning agents, to biological organisms found in carpeting and furnishings. Outdoor allergens can be pollen, dust and smog from pollution and noxious vapors, insect stings. Common foods which cause allergies are milk, fish, eggs and nuts. Although most allergic reactions are not life threatening, some can cause the patient