I have horrible allergies
I have allergies that are mostly seasonal but really bad allergies to corn pollen which is unavoidable since I live in Iowa. 
I have terrible allergies too- especially to cats. What other kinds of allergies are there?
Food allergies and allergies to all types of pollen. That's why during certain seasons people develop hay fever especially during harvest.
What exactly causes allergies? 
It's a hypersensitivity of the immune system that is triggered by things in the environment. 
How are seasonal allergies different from food allergies?
Food allergies happen anytime you touch or ingest a certain food. Seasonal allergies happen during peak times of the year when pollen or other plants particles are in the air. 
What are cat allergies considered?
Allergies in cats
Cats exposed to allergens may develop allergies or allergic reactions. Allergies tend to become evident and intensify over extended periods of time and can take years to develop. Some allergic diseases and allergies in cats include feline atopic dermatitis, flea allergy dermatitis, feline-mosquito hypersensitivity, and food-induced allergy. In the case of feline atopy, hypersensitivity to allergens is due to genetic predisposition. However, various allergies may arise due to environmental factors. Allergens, ingested, inhaled, or airborne, can be seasonal
seasonal allergies called “Extreme allergies and Global Warming”, have found that many allergy triggers are worsening due to climate change. 16 states in the United States were named as “Allergen Hotspots” for large increases in allergenic tree pollen if global warming pollution keeps increasing. Therefore, researchers on this report claimed that global warming is bad news for millions of asthmatics in the United States whose asthma attacks are triggered by seasonal allergies. Indeed, seasonal allergies are one of the main triggers for asthma, along with colds or flu,