Allergies

In an Australian program, 271 of 778 infants with a peanut-allergy label ate peanut under supervision without reacting, while 61 had anaphylaxis. The study covers infants only, and the retest belongs in an allergist's clinic.

The sneezing that waits until you're in bed has a real mechanism behind it — three of them, actually, and they compound.

The exhaustion of fall allergy season has at least three sources, and the pill is only one of them. Here is how to tell which one is wearing you down.

The idea that allergy pills 'stop working' after months of daily use isn't well supported by the evidence — but the FDA has flagged a real, different reaction to watch for when you quit.

It's not just distraction. Cortisol bottoms out at night while histamine activity rises, and mosquitoes themselves are built to hunt hardest at dusk and dawn.

The idea that Zyrtec or Claritin "stops working" after enough years is mostly folklore. The medicine that genuinely does lose its effect is the decongestant spray sitting next to it.