History Main / PlotAllergy

* In ''Film/AquamanTheCastOfTheAngler'', the Angler suffers from a potassium deficiency and must eat a banana every 30 minutes or die.

** In one episode, [[GenderBlenderName Sam]], the one chosen to represent her team for a spelling bee, starts eating a snack brought by David, but learns too late that it contains coconut, which she's allergic to. It isn't life-threatening, but she can't go to school and David has to take her place, despite being less confident.
** Averted in the character of Nathaniel, who has a bunch of allergies, including dogs. He spends the night at Joe's house, which forces Wishbone into being shut away in another room. It turns out his allergy ''to dogs'' is psychosomatic, induced by his mother because ''she'' doesn't like them. (He may have other real allergies, but none of them get near as much attention.)

--->'''Tokusa''': But wait, why are you wearing a mask? And Gloves?\\
'''Kuroki''': Huh? Because I'm allergic to cats.\\
'''Tokusa''': What? Wait, so why did you get a cat...?\\
'''Kuroki''': Because they're cute!

* In the ''Series/MidsomerMurders'' episode "Red in Tooth & Claw", someone places rabbit fur in the ducts of Cleo Langton's car. Turning on the A.C. system with the windows closed triggers her allergy to rabbits, and someone had removed the allergy medication from her purse, so she dies by respiratory failure.

* In the ''Literature/{{Goosebumps}}'' book ''I Am Your Evil Twin'', the main character uses his peanut allergy to distinguish himself from his evil clone--since they aren't sure how allergies work, he supposes that the clone might not have it. (After the climactic test, though, it turns out that the clone swapped out the test food for one that he wasn't allergic to, and then made himself throw up so everyone would think he was the real thing.)
* ''Literature/JaineAustenMysteries'': In ''The PMS Murder'', Marybeth Olsen is killed via someone taking advantage of her peanut allergy.

* ''WesternAnimation/MiraculousLadybug'': Adrien/Chat Noir is allergic to feathers, which comes up in the episode where he and Ladybug have to fight a pigeon-themed akuma.

* ''WesternAnimation/WeBareBears'': In "Panda's Date", Panda accidentally eats a cookie with nuts in it, which triggers a severe allergic reaction; when Lucy, a nearby grocer, administers an Epipen injection, [[RescueRomance he falls in love with her]]. But LoveMakesYouDumb, and his jealousy and possessiveness lead to Panda acting in weird ways, culminating in him eating Lucy's Thai meal, which has peanuts in it, ruining the date.

* ''VisualNovel/DanganronpaV3KillingHarmony'': Tsumugi Shirogane, the ''Ultimate Cosplayer'', suffers a bizarre allergic reaction if she tries to dress up as a real person, which means that she cannot disguise herself as her fellow classmates as a MurderMystery trick. In the climax of the story, [[spoiler:Tsumugi starts cosplaying as characters from previous ''Dangan Ronpa'' entries, indicating that in this canon, the previous games are in-universe fiction.]]

* The ''FanGame/MarioDrinksAGlassOfMilk'' trilogy takes this to absurd levels with Luigi's lactose intolerance. Merely ''carrying too much milk in a tank '''on his back''''' starts draining his health, and being submerged in milk kills him faster than [[SuperNotDrowningSkills the lack of oxygen]] would!

* In an old ''ComicBook/SupermansPalJimmyOlsen'' comic, Jimmy notices a funny ticking sound whenever he's around Superman, which he thinks is his heart. He concludes he has an allergy to the Man of Steel and must stay away until he can find a way out of it, or he risks death by heart attack. He eventually figures out that it was his signal watch, which malfunctioned and ticked whenever it was around gold.

* The graphic novel ''ComicBook/{{Peanut}} revolves around a girl who fakes having a severe peanut allergy in a bid to make herself more interesting after transferring to a new school.

* ''WesternAnimation/KingOfTheHill'': Bobby suddenly develops an allergy to dog dander late in season 5, which when Hank refuses to put down or otherwise give up Ladybird results in them trying medication and then, when that doesn't seem to work, putting Ladybird in a custom doghouse -- which Bobby ends up moving into instead when Ladybird doesn't like it. Lampshaded by the doctor who gives the diagnosis, who tells the Hills that "allergies come and go"; sure enough, Bobby's over the allergy by the halfway point, with the rest of the plot dealing with his refusal to move back out of the doghouse.

* In ''FanFic/ThisBites'', eating biscuits gives Cross an instantaneous and horrible case of diarrhea. It's unclear why, and it's not much of a plot point; it's barely even a RunningGag.

* ''VisualNovel/PhoenixWrightAceAttorneySpiritOfJustice'': In "Turnabout Storyteller", [[spoiler: the culprit, Geiru Toneido]], is allergic to buckwheat. This becomes relevant when the victim turns out to have been making udon instead of soba. If the victim had been making soba, they would have died from inhaling the buckwheat flour instead.