Food/airborn/whatever kinds of allergies you have- anything that your body hates, or that hates your body.
I've got pretty freaking bad food allergies. I'm extremely intolerable of gluten and casein. Gluten, and I'm still developing an understanding of what all it's in, is basically this substance that gives certain foods their spongy texture.
i.e. It keeps bread together and makes it's chewy. But it's insane, it's in so many foods- it's infuriating. 90% of cereals, all breads, cakes, anything breaded, and all these abstract things you would never think to find it in.
Then there's casein, which is easier to explain- it's dairy. Milk, yogurt, ice cream, all that stuff. With both of these combined, it's almost impossible for me to go out to eat. I have to bring my own bun to restaurants and crap like that. Gah.
Side-effects of consumption of either of these for me are really, terribly bad stomach aches that last quite some time, pretty bad lethargy, headaches, and my doctor said depression, which I'm not quiiite sure about.
And, unlike some food allergies, these are here for life <3
But enough of my whining, tell us all about your stupid allergies.