What can you tell me about allergies?
Allergies are usually caused by a hypersensitivity of your immune system to your surrounding environment, so it could be caused by many things.
Have humans always had them?
It seems like it is possible, especially having symptoms like red eyes, a runny nose, and sneezing! Luckily there are products to help ease those symptoms.
What percent of the population deals with it?
I am not sure the exact numbers, but I know the numbers seem to be rising for kids with asthma and food allergies. 
How is it treated?
Some people go through allergen immunotherapy where you are actually exposed large amounts of the allergen to change your body's response.
That's interesting. Do people ever die from allergies?
Allergen immunotherapy
Allergen immunotherapy, also known as desensitization or hypo-sensitization, is a medical treatment for environmental allergies, such as insect bites, and asthma. Immunotherapy involves exposing people to larger and larger amounts of allergen in an attempt to change the immune system's response.
Meta-analyses have found that injections of allergens under the skin are effective in the treatment in allergic rhinitis in children and in asthma. The benefits may last for years after treatment is stopped. It is generally safe and effective for allergic rhinitis
that produce a variety of hormones including adrenaline and the steroids aldosterone and cortisol. They are found above the kidneys.
- Allergy – Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, a runny nose, shortness of breath, or swelling. Food intolerances and food poisoning