Allergies are things that annoy the body and can be present at birth or develop later in life. There are two main types of allergies: food allergies like celiac disease, eggs, fish, fruits, potatoes, and tomatoes, and body allergies like creams, shampoos, climate, and flowers. Allergies cause symptoms within minutes like sneezing, itchy eyes, wheezing, rashes, swelling, and digestive issues. They cannot be infected and prevention involves avoiding allergens, seeing a doctor, and taking prescribed medications or creams.