This might surprise you, but it is possible that you have had an allergic reaction without even knowing it at some point in your life. When most people think of allergic reactions, they picture allergy attacks. You know what I'm talking about. It's the classic image of kids wheezing with stuffy noses and runny eyes. Some people have even seen severe allergic reactions, life-threatening events that can strike suddenly and for no apparent reason in rare cases. In reality, however, your typical allergic reaction is much more mild. A runny nose, and itch in the back of your throat, dry eyes, or even itchy skin can all be signs of an allergy reaction.
Of course, these kinds of allergic reactions don't necessarily require treatment. Basically, the test is whether or not it makes you uncomfortable. Many people occasionally have an allergic reaction to the changing seasons, to a certain type of food, or even to medication, without having a serious problem. If, however, your allergies ever become more severe than that, you might want to think about treatment it can really help fight allergy attacks.
One of the scary things about allergic reactions is that they can be quite sudden and occasionally, very serious. This is why, if you had allergies in the past, you might want to think about carrying around epinephrine. An epi-pen will basically give you a shot of adrenaline, stopping the allergies as soon as they start. If you get a big attack and your airway starts to close up, this can actually save your life!
These days, there are quite a few different kinds of treatments for allergic reactions. I used to get allergy shots when I was a kid, but I've stopped having to. Nowadays, when I have an allergic reaction, it will usually go away if I take an over-the-counter decongestant and an antihistamine. I will not feel completely better right away, but it just doesn't seem worth the ordeal of having to go through shots again.
Sometimes, the best ways to treat an allergic reaction is to reduce your exposure to whatever the allergen is. You might have to stay away from cats, avoid going outside on days with a high pollen count, stop eating certain foods, or even avoid certain perfumes. Whatever it takes, you should do it. You'll feel better, and the inconveniences usually aren't a very big deal.