I just had an allergy test and I’m allergic to dust. I was tested for everything else like eggs, strawberries, mold, grass, peanuts, shrimp, etc. Isn’t everyone allergic to dust? They sneeze when it’s around. Anyway, what are you allergic to?
Grass pollen seasonally, but that pretty much went away about five years ago. It creeps up on really high pollen-count days.
I had a surprisingly strong reaction to my friends’ rats, too.
In any case, a true allergic reaction is more than a sneeze. A normal sneeze in response to dust is like a nasal tickle, it’s to expel the dust. An allergic reaction is you immune system going ape-shit over practically nothing.
Avon brand mascara. Or something in it, rather.
Makes my eyes water more than the ending of “Old Yeller.” Which pretty much defeats the purpose of mascara, ya?
I haven’t been tested by a doctor, but apparently to either dust or mites (carpeting and a/c) and also to the pollen of some plants. I get congested from the diapraghm on up (“nasal congestion”? nope, my nose isn’t that big!). You don’t realize what a wonderful thing it is to be able to breathe until you have spent a few days not being able to do it properly.
One day in Mass a few months back I was getting so sick I was thinking of getting out. A few weeks after that sunday, Mom called me to the living room and I told her I wasn’t getting in there, as apparently one or another of her flowers was triggering my allergies; walking into the room, or in front of it with the door open, meant an instant headache and congestion.
Turns out she’d found out which flowers specifically had been used for that Mass and had been systematically going down the list, to find out which ones triggered the allergy. I haven’t commited matricide (yet)… Her response when I got angry was “oh, c’mon, it’s not like you get asthma!”
I was diagnosed allergic to dust when I was a little kid. Like garygnu said, it’s not just a sneeze - it’s a full-blown case of mucous-production-line, complete with itchy skin and watery eyes.
That, plus regular seasonal allergies. Why is my immune system so frigging stupid?
Cats, mold, and pollen.
A real pity, too. I’d really like to have a cat. Sadly, I tear up something fierce when I visit a cat-owning household.
I got the whole scratch test thing done, and reacted to 138 different common substances to varying degrees, but I have personal experience with the classic anaphylaxis [throat and tongue swelling, not pleasant at all.] from mushrooms. I get vomiting and abdominal pain from clams, mussels, and scallops. I get diarrhea from palm products. I am allergic with various reactions to an amazing array of antibiotics and a few other meds. I usually find out when they get prescribed to me and I have a reaction 
I keep a good listing with my records.
And I am decidedly not allergic to poison ivy, I do not go out of my way to play in a patch of it, and I wash up thoroughly if I do end up in contact with it … but I have been exposed to it a number of times with no reaction whatsoever [including dropping trou and peeing in a patch of it that i did not see in the dark] mrAru unfortunately seems to be able to get it from looking at a picture of it online sigh
I will plainly state that I dislike some food rather than claim to be allergic to it.
Had the full-blown testing (environmental and venom) in November, and found-
- All kinds of grass and their byproducts (hay, etc)
- Most kinds of trees
- Dogs, cats, birds, horses, roaches
- Dust
- Mold of some fashion
- Bees, wasps, ants (especially fire ants, but those damn little black ones are bad for me as well).
Amusingly, I work outside with horses, and live in the country with three dogs, 2.5 cats, and two birds. It was nice to finally have an explanation for the searing, chronic headaches I’d had for the past 5 years. 
I’m on three different allergy meds, two asthma ones (apparently on the PFT I blow numbers “equivalent to a very small child”- who knew?), and my allergist was so horrified that I didn’t have an epi pen already that he made me wait while he found one to give me before he’d let me leave the office. He was shocked I’d only had three trips to the hospital for anaphylaxis in the past few years.
I’ve recently spotted cow ants (AKA velvet fire ants- though ‘ant’ is a misnomer) around the barn at work, and have made it very, very, very clear to the kids that the first one of them that gets me stung by a cow ant, intentionally or otherwise, gets the second dose from my epi pen in the most painful spot I can reach. 
There are a couple medications too- doxycycline makes me look like a raccoon that’s gone three rounds with a heavyweight boxing champ, and pyridium makes me projectile vomit, so Og help me when I get a UTI. Amitriptyline makes me jittery as hell, in a ‘I’m about to have a heart attack’ way, and the iodine-based contrast they use in scans gives me hives.
Everything.
No, literally, I have this over-active immune system just itching to give me problems. If I visit another continent where there’s none of the local allergens, I have about two weeks of relief before good ol’ histamine picks a new trigger. I can’t wear contact lenses, even though I hate glasses, because my eyes are bone dry all the time. In two words: it sucks.
I don’t know what I’m allergic to at home. It doesn’t matter.
Most antibiotics, and pseudoephidrine. I just have to manage not to get sick!
Animal hair, shrimp (preparation gives me an allergic reaction but I can eat it just fine) and penicillin.
Since this is a poll, I’m moving it to IMHO.
twicks, MPSIMS moderator, who’s allergic to shrimp (nope, not other shellfish, just shrimp)
I’m allergic to artificial food coloring.(red 40 yellow 5)
Found that out the hard way after eating most of a bag of christmas colored red,blue,and green tortilla chips.
I woke up the next morning covered in a rash, blisters on my hands and my face was swollen up to the point I could barely open my eyes. Not a fun thing to wake up to at 7 in the morning, in December, in Michigan.
Penicillen, which developed late in life!
From mildest reaction to severest: cats, grass pollen, dust, mold, various seasonal pollens, juniper. I know juniper is a seasonal pollen, but I react so strongly to it it gets it’s own mention.
I’m allergic to bee and wasp stings, most insect bites, and five different kinds of antibiotics. My doctor has asked me, rather plaintively, to TRY to not develop an allergy to any more antibiotics, as I’m a pain to prescribe for. I have assured him that while I might be a problem patient in other ways, I have never attempted to develop an allergy to anything.
It was especially fun when I was in the hospital for MRSA, and they hooked up an IV of some antibiotic, and I was fine…then during the midnight shift, they hooked up another IV of the same antibiotic, and I developed the classic symptoms. I hollered for a nurse, who got me my Benadryl or whatever they use for reactions, got the rash and itchiness cleared up, got hooked up to another antibiotic…and developed another reaction.
I have hay fever, too, but my reactions to the other stuff far outweigh my hay fever problems.
Nothing. Seriously. Not even poison ivy. Although I do try to avoid poison ivy, as I’ve heard that with repeated exposure to a common allergen or irritant, you can develop an allergy later in life.
Apparently I’m the only one allergic to something stupid. I’m allergic to one of the several artificial cherry flavorings found in varying products. No cherry Kool-aid, and no cherry Pepto, but cherry chewable Tylenol is alright. It’s very weird.
Nickel, so no cheap jewelry for me. I wore a cheap necklace to my friend’s wedding, by the end of the night I had a rash circling my neck. Belt buckles are great for this too, so I pretty much have to wear a cami tucked in underneath even with the ‘nickel free’ ones as they tend to still have minute amounts of it.
Penicillin, and other medicines derived from. Made my last sinus infection/ear infection fun.
And for some odd reason… Kokanee beer. No idea why, but I drink it and I get drunk off half a can and develop a rash. No other beer does this to me.