I was allergic to cats (cat hair) for a long time when I was young, but it seems less obvious nowadays. My eye(s) would completely swell up and annoy the hell out of me, and it would sometimes be accompanied by hayfever-like symptoms. My eyes can sometimes itch a little now, and my nose might get blocked up or start running, but it's hardly comparable to how it used to be and I'm so glad for that. Many of my close friends and neighbours have cats and I remember the days of having to avoid them at all times, occasionally failing to do so and gouging out my eyes in irritation...

While not an allergy, I also had asthma when I was younger, but that's gone too. Even hayfever is not as bad these days (maybe I just don't notice it because I don't go outside as often? XD). I wonder what happened.