When a character convinces another (perfectly healthy) character that they are ill, often in order to get them out of the way for a little while, or just to mess with their head. To accomplish it, they may employ [[MotorMouth fast talking]], [[ExpospeakGag medical jargon]], obviously fake medical devices, etc.; they might even [[AssPull make up a whole new disease]]. Expect them to say "You don't look so good," or "You're a very sick man."

The victim almost always falls for it, often expressing a desire to "go lie down". May result in YourDaysAreNumbered and/or MistakenForDying. This trick cannot, however, actually hurt or kill a person like in the case of the CompellingVoice or YourMindMakesItReal. Typically PlayedForLaughs. Compare {{Gaslighting}}, and YouDontWantToCatchThis.

In an inverse, sometimes a fictional disease will be whipped up that has ''no'' symptoms and apparently only targets healthy people and is allegedly fatal. This is employed almost exclusively on very gullible people.

A SubTrope of {{Hypochondria}}. Compare MunchausenSyndrome By Proxy, which involves actually ''making'' someone sick in order to get positive attention from others for taking care of them.


[[folder: Anime/Manga]]
* The manga version of ''Manga/ExcelSaga'' had a chapter in which Iwata was MistakenForDying, which ended by revealing that his doctor (and SitcomArchNemesis) had faked his diagnosis. The next chapter started with the team's mentor Kabapu announcing that Iwata had died; the doctor had only ''exaggerated'' the symptoms to try to get the case into a medical journal.
* In ''Manga/{{Gintama}}'', Kagura fakes being deathly ill on one occasion to make Gintoki and Shinpachi appreciate her more and wait on her. It ends up backfiring on her when she really does get sick as a result of her poor lifestyle, plus [[TheGadfly Okita]] sees through the ruse instantly and makes things even worse for her by somehow convincing Gintoki that she's ''dead''...

* In DC Comics, a doctor fakes a medical report to con TheJoker into believing that he's dying. The doctor hopes to "scare him straight". Instead, the Joker goes through the stages of grief in ''five minutes'' and after reaching "acceptance" decides to go on a [[TheLastDance final rampage]] of such hideous scope that it becomes a CrisisCrossover.
** Similarly, Clock King started doing crime because of a doctor telling him he was dying so that his sister could live comfortably when he was gone. However, it turned out that this was genuinely an accident and the doctor was mistaken. As you can imagine, when he got out of prison Clock King tried to kill him for ruining his life.
* In a 1940s {{Superman}} story, "The Three Kingpins of Crime," Superman has to prove a gangster killed the wife of a prosecuting attorney. He tells the murderer that if he was at the victim’s house, hiding in the bushes, he would have been exposed to poison ivy. To prove the man is guilty, the policeman simply has to wait until his rash appears. Sure enough, the man becomes so itchy that he confesses to the murder in exchange for medical attention. It is then revealed that the bushes the criminal was hiding in were not poison ivy and it was his guilty conscience that caused him to itch.

[[folder: Film - Animated]]
* In Disney's ''Disney/{{Pinocchio}}'', "Honest John" does this to get Pinocchio to go to Pleasure Island.
* In ''WesternAnimation/{{Shrek}}'', Shrek and Fiona convince Donkey that he doesn't look so good. They were actually just using him as an excuse to spend another day together, but he's so neurotic that he falls for it anyway.

[[folder: Film - Live Action]]
* In the 1937 movie ''Shall We Dance'', Peter Petrov talks his nagging manager into becoming seasick so he can go on a date without interference.
* Zigzagged in ''JoeVersusTheVolcano''. Joe was a hypochondriac to start with. Then his doctor informed him that he had a fatal condition, completely unrelated to all his symptoms. No longer having any reason to worry about his health, he immediately stops fretting about his imagined illnesses and feels much better. In the end [[spoiler:it turns out he wasn't sick at all, the doctor was part of plot to get him to agree to be a HumanSacrifice.]]
* In ''Escape from the Newsroom'', several people try to make Ken Finkleman believe he is sick due to exposure to anthrax.
* In ''Film/ADayAtTheRaces'', this is the reason Dr. Hackenbush is so well trusted by Mrs Upjohn:
--->'''Mrs. Upjohn:''' Why, I never knew a thing was wrong with me before I met him.
* In ''The Secret of Film/DrKildare'', a young woman given to nervous headaches is convinced by a meddling friend that something is seriously wrong with her, and taken to a cancer quack.

[[folder: Literature]]
* In ''[[Film/TheLordOfTheRings The Two Towers]]'', Wormtongue has convinced King Théoden that he is far too ill to lead men into battle, possibly with the aid of a CompellingVoice. Gandalf convinces him otherwise.
* Used non-humorously in the novel ''Angel's Kiss''. A character gets petty vengeance on an apparently healthy man who slighted him by telling him that he looks ill. He is so convincing that the man goes to his doctor--and discovers he has cancer.
* In ''Mind Games'', the protagonist develops a psychic ability that has this effect. She has hypochondria herself, and can get rid of her health anxiety by pushing it into others. This doesn't actually make them ill, but their resulting actions might.
* In the first installment of GordonKorman's ''MacdonaldHall'' series, George is already a hypochondriac, but Boots makes it worse by inventing a deadly tropical epidemic and convincing George that he has it.
* Forms part of the opening of ''Three Men in a Boat'', in which Jerome reads a medical dictionary from cover to cover and becomes convinced that he is suffering from every single disease described therein. [[RunningGag Except housemaid's knee]].
* In the first half of ''Literature/TheTwits'', during which Mr. and Mrs. Twit play nasty pranks to get revenge on each other, Mr. Twit uses this for his biggest and best prank. Every night he adds a tiny sliver of wood to the bottom of his wife's chair and cane, convincing her that she's shrinking. He tells her that the only remedy is to be stretched, by tying her to a bunch of balloons and stakes so that she's painfully stretched by them both.
* In the short HerculePoirot story "The Adventure of the Egyptian Tomb", the resident doctor diagnoses [[spoiler:leprosy in his friend who is actually suffering from a minor skin ailment, [[DrivenToSuicide driving the poor man to suicide]] in order to inherit his money]].

[[folder: Live-action TV]]
* Happened a couple of times on ''Series/{{MASH}}'' as the surgeons used it to get an annoying superior officer out of the way for a little while. Once (possibly the last time they used this device) Hawkeye and BJ got in a serious disagreement, because Hawkeye removed the appendix of a person who didn't need his appendix removed.
* An episode of ''Series/MalcolmInTheMiddle'' revolved around the brothers trying to dispose of evidence of what they consider to be the worse thing they ever did: convince their mother she had cancer so she'd be too distraught to get angry at them for their poor report cards.
* In an episode of ''Series/{{House}}'', House managed to convince an airplane full of people that the symptoms of the disease they already believed they might have caught included things like a spasming left hand. Right on cue, they all starting having those symptoms, proving that they were suffering from mass hysteria.
* In an episode of ''Series/DrakeAndJosh'', Megan somehow tricks Drake into thinking he has a horrible disease that can only be cured by soaking his hands and feet in several gallons of [[ToiletHumor lizard pee]].
* ''Series/{{Leverage}}'', "The Order 23 Job." The team notices a CorruptCorporateExecutive about to go away to Club Fed seems to have germophobia... so they drug his water, send him to the hospital, then hijack an entire wing to make him think he's ended up in the middle of a pandemic. At one point, they manage to give the target a ''real nosebleed'' entirely through the power of persuasion.
** In another episode the crew convinces the curator of a museum that he has fallen ill due to a mummy's curse, or at least from fungi in the sarcophagus.
* In an episode of ''FullHouse'', Joey brought home two Counting Crows tickets and Michelle got upset that her sisters would get to go and she wouldn't. Danny made them draw straws and when Stephanie lost, she and DJ concocted a plot to convince Michelle she had the made-up "Shmedrick's Disease" so she would have to stay home. It ''almost'' worked until Michelle gave them a heartfelt speech about how she just wanted to go to the concert so she could be cool like her big sisters.
* In an episode of ''Series/AreYouBeingServed'', the staff convince Mr Rumbold that he's suffering from some unspecified stress-related disease, and that he should dismantle the security cameras to save himself from the urge to watch them all the time.
* In one episode of ''Series/MissionImpossible'', the team tricked a man who mass-produced counterfeit pharmaceuticals into believing that he'd contracted the disease that his phony drugs are supposed to cure in order to make him give an EngineeredPublicConfession about the quality of the medicine the doctor at the clinic (Actually Barney) wanted to give him.

[[folder: Opera]]
* Bartolo, the Count, Figaro, ''and'' Rosina all (for very different reasons) use this on Don Basilio in Rossini's ''The Barber of Seville.''

* There's a variant in ''VideoGame/{{Fallout 2}}'' wherein you can trick a slavemaster into thinking one of his slaves has a disease (made-up and named after your character.) Symptoms include shiftlessness and unwillingness to follow orders. It's highly contagious, so he'd better hand that slave over to you before it contaminates the rest.
** Can also be done while bartering for some slaves (to free them of course!) in VideoGame/FalloutNewVegas
* One puzzle in ''VideoGame/StrongBadsCoolGameForAttractivePeople: Strong Badia the Free'' involves convincing Strong Sad that he has "acute aphasic pretendicitis". Symptoms include uncontrollable shaking, a high fever, and inability to comprehend spoken language (achieved by [[spoiler: clever use of a malfunctioning toy, application of a lighter to Strong Sad's thermometer, and attempting to communicate with [[TalkativeLoon Homsar]], respectively]]).

[[folder: Webcomics]]
* In ''Webcomic/StandStillStaySilent'', when Emil finds a bruise in his face and [[{{Hypochondriac}} asks Mikkel if there's risk of scarring]], Mikkel has some fun telling him that face-bruises can turn ''cancerous'' if not properly bandaged. Made even funnier when Emil then tells Admiral Olsen that his face is bandaged to prevent face-cancer, and Olsen [[OhNoNotAgain recognizes that lie and starts looking around for Mikkel.]]

[[folder: WebOriginal]]
* The Wiki/SCPFoundation has a rather odd example in [[http://scp-wiki.wikidot.com/scp-1025 SCP-1025]], which [[spoiler: causes hypochondria-by-proxy: others perceive anyone who reads it as contracting a number of dangerous diseases. It caused panic in several researchers before another Foundation agent took the book away and [[MundaneSolution stuck it in a box where it can't affect anyone else]].]]

[[folder: WesternAnimation]]
* WesternAnimation/BugsBunny was fond of this trick, even to the extent of using spotted glasses to convince Elmer Fudd he was "seeing spots".
** "Hare Tonic" has Bugs convincing Elmer he has "Rabbititis", and does this by making him "see spots" by painting the entire living room and tricking him that he's turned into a rabbit by [[MirrorRoutine removing the mirror glass and mimicking Elmer's movements]].
** "Dr. Devil and Mr. Hare" consisted almost entirely of Bugs doing this to the Tasmanian Devil.
** The WesternAnimation/LooneyTunes cartoon "The Hypo-Chondri-Cat" takes this gag to its ultimate degree, as mice Hubie and Bertie eventually convince Claude cat that he's ''dead''.
* In the ''WesternAnimation/DuckTales'' episode "The Money Vanishes", the Beagle Boys steal Gyro's latest invention by convincing him he has Inventoritis from being too sedentary, and needs to start jogging... right this instant. He jogs away and they have the run of the laboratory.
* In the ''WesternAnimation/HeyArnold'' episode "Monkey Business", Helga believes she has contracted "Monkeynucleosis" and will die from it after an organ grinder's monkey kisses her on the arm, which gets red, itchy, and puffy shortly after. The sweaty palms and loss of appetite were all in her head, and her irritability is common throughout the series due to her {{Tsundere}} tendencies toward Arnold. Phoebe confirms this, and that all Helga got was a rash on her arm from contact with the monkey.
* In the ''WesternAnimation/EdEddNEddy'' episode "A Case of Ed", Edd convinces himself that he has a rare and deadly disease, and Eddy decides to take advantage of this for a few cheap laughs. Edd is ''not '' amused when he learns the truth.
* In one episode of ''GummiBears'', Cubbi and Gusto end up captured by Toadwart and a pair of ogres. They convince the ogres that they have "gummioleosis", a highly-contagious disease. For added points, they give the ogres a "cure" that involves bathing (anathema to ogres) and scrubbing their chicken pox-like spots (paint) with "one small ogre"...and the two ogres run off chasing after Toadwart.
* In one ''WesternAnimation/TomAndJerry'' short, Jerry painted spots on Tom to make him believe he had measles. Tom eventually finds out and goes after Jerry, but finds that now Jerry had the measles for real.
* In an episode of ''Help! It's the Hair Bear Bunch!", the bears convinced the zookeeper, Mr. Peevely, that he had "zoo-lirium" and had to take a vacation from the Wonderland Zoo.
* ClassicDisneyShorts brought us "Donald's Day Off", were DonaldDuck's nephews prank him into thinking he's sick to the point of soon death. Made hilarious by how Donald is convinced of his "disease" to the point of ignoring logic and reason:
--->'''Donald:''' ''*walking with his eyes closed*'' I can't see! Oooow, ooooow! Oh me, oh my ''*Gets hit with a toy train*'' Ouch! ''*Opens his eyes, pushes the train out of the way, and keeps on being "blind"*'' OOOW, OOOOOW, OOOOOOOW! ''*Faints*''
** In the ''HouseOfMouse'' short "Mickey's Remedy", MickeyMouse tricks Don's nephews into thinking that they have "Bolvanian Brain Fever" to teach them a lesson after they've taken advantage of him by PlayingSick. He goes as far as convincing them that they have died, and will go to [[NeverSayDie "the bad place"]] unless they redeem themselves: when Donald returns, he is shocked to find them perfectly well-behaved.
* In the ''TheSimpsons'' episode "Little Big Mom", Lisa is angered by Bart and Homer's slovenliness and convinces them they have leprosy to teach them a lesson.
* In the ''SpongebobSquarepants'' episode "Once Bitten", Patrick convinces Squidward that Squidward has Mad Snail Disease, kicking off a panic in all of Bikini Bottom. Slightly unusual example in that Patrick isn't trying to get rid of Squidward; mostly he seems to enjoy the attention and the fact that people listen to him and treat him like an expert.
** Another episode has Squidward getting annoyed by [=SpongeBob=] [[AnnoyingLaugh constantly laughing]] and convinces him that he has a disease where if he doesn't go 24 hours without laughing, his "laugh box" will break and he will never be able to laugh again. Inverted in the end when the disease turns out to be ''real'' and it happens to Squidward. Luckily, [=SpongeBob=] donates part of his laugh box to Squidward.
** Another episode has Squidward trick [=SpongeBob=] that he (Squidward) has contracted "Squid's Disease" in order to get [=SpongeBob=] and Mr. Krabs to think he should go home sick. [=SpongeBob=], however, being paranoid, begins to believe that he caught it.
* In the ''WesternAnimation/SouthPark'' episode "Bloody Mary," Randy Marsh drives drunk and gets pulled over and prosecuted for a DUI offense. Part of Randy Marsh's sentence for his DUI is enrollment with Alcoholics Anonymous and their twelve-step program. At first, he is only willing to confess that he "really like[s] beer," but the AA members not only push him to say that he is an alcoholic, but Randy begins to compulsively drink alcoholic beverages, convinced that he is an alcoholic. HilarityEnsues after this, culminating in Stan convincing Randy that he is indeed able to control his alcohol consumption, [[StatusQuoIsGod restoring the status quo]].

* In ''ComicStrip/{{Dilbert}}'', Dilbert convinced Stan the Marketer that he had altered his DNA through his computer. Being a marketer (whose career is built upon unverified consumer anecdotes), Stan actually believed him and started growing whiskers and a cute little nose. Eventually Dilbert "cured" him by saying a report taken out of context from an unrelated focus group said he wasn't changing after all.
* At least one ''{{Garfield}}'' strip has Garfield cause a dog to faint doing this.