"(Sim Name) isn't feeling so hot. You may want to keep him/her around a bathroom."

— Moodlet description in The Sims 3.

Nausea, vomiting, or being nauseous, is an illness encountered in various Sims games. While vomiting was first introduced in The Sims 2, and that it is a motive in The Sims 2 (PSP), the concept of nausea as a designated illness was first codified in The Sims 3 where it is a very common illness that a Sim will typically get once a week on average.

As a rule of thumb, nausea on its own is not contagious at all, no matter how close the nauseous Sim is to any other Sims. It will also never result in death on its own.

The Sims 2

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The Sims 2 (console)

During the Tranquility Falls chapter in The Sims 2 (console), two of Larry Liu's wants involve making an eel-and-squid carpaccio ("Make Nausea Meal") and to then serve it to Candi Cupp, for a combined 600 aspiration points.

The Sims 2 (PlayStation Portable)

In The Sims 2 (PSP), Nausea is one of the 8 motives of Player Sim. The motive is known to drop drastically if Player Sim spots a zombie.

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The Sims 3

In The Sims 3, it is a common illness that Sims can experience from a wide variety of causes. Affected Sims will get the "Nauseous" -25 moodlet that lasts for 2 hours. When moodlet expires, the affected Sim will abandon their current action row to run to the nearest toilet to vomit. If no toilets are on the lot, the Sim will vomit on the ground on the spot. Nausea isn't contagious or fatal and is effectively cured after the affected Sim vomits once. There are many different ways for Sims to become nauseous.

Regular nausea can be prevented forever with the "Strong Stomach"^[TS3:IP] or "Simmunity"^[TS3:S] lifetime rewards, which cost 2,000 and 7,500 lifetime happiness respectively. If the Sim is inside a rabbit hole when the timer expires, the Sim will usually not exit the rabbit hole in order to vomit.

If a Sim has already become nauseous, consuming or inhaling Sweet Grass^[TS3:UL] is known to cure it.

Plumbots^[TS3:ITF] are immune by default to all causes except for Visceroidal Nausea, and even then does it never count down or expire due to a glitch.

Cause	Description	EP	Chance
Morning Sickness	Morning sickness will always happen when a Sim is pregnant and in the first trimester. Sims will randomly get the "Nauseous" moodlet and eventually they will vomit. Shortly after vomiting, the Sim will once again become nauseous	&BG	100%
Food Poisoning	If Sims eat spoiled or burned food they will usually receive the "Nauseous" moodlet.		100%[note 1]
Eating Meat	If a Vegetarian eats meat, they will receive the "Nauseous" moodlet and will vomit after a while. It also happens to Vegetarian vampires who drink from Sims.		100%
Bistro Event	When eating a meal at a bistro, a chance card can sometimes appear where the player Sim does not like the food. Choosing to continue the meal will give the Sim the "Nauseous" moodlet. Additionally, the Investigator quest "The Case of the Culinary Backstab (Part 3)"[TS3:A] that has the Sim eat at a bistro, will always give the "Nauseous" moodlet when completed.		100%
Moodlet Manager Zap	A successful use of "Zap" will give the target one of 19 possible negative moodlets, one of which is "Nauseous".		5.26%
Dumpster Diving	When dumpster diving, the Sim may get the "Nauseous" moodlet when getting out of the dumpster again.		30%
Visceroidal Nausea/Tiberium Poisoning	Keeping Tiberium, a radioactive rock, in a Sim's inventory for a while will give them the "Visceroidal Nausea" moodlet, which is similar to the normal "Nauseous" moodlet.	&EP01	100%
Eating Mummy Snacks	If anyone who isn't a mummy eats a Mummy Snack, they will get the "Nauseous" moodlet. (Mummies instead get the "Great Meal" moodlet.)		100%
Floor Hygienator Temporary Malfunction	When a floor hygienator isn't created by Sims that have completed the Master Inventor skill challenge, it will have a temporary malfunction that causes it to backfire to the Sims, causing them to get nauseous.	&EP02	2.5%[note 2]
Experimental Treatment	Sims who work in Medical career level 4 or higher can try an experimental treatment on themselves or other Sims. One of the possible outcomes of the treatment will cause Sims to get nauseous.		13.79%
Consuming Plasma	When anyone who isn't a vampire drinks plasma or eats any products containing plasma, including pancakes with plasma fruit or plasma fruit nectar,[TS3:WA] they will get the "Nauseous" moodlet.	&EP03 or&EP07	100%
Vampire Eating Garlic	When a vampire eats garlic, they will get the "Nauseous" moodlet the first time around. Eating a second garlic while still nauseous from the first one will instead give the Knocked Out moodlet.		100%
Seeing VIP Section Sneaker	If a person who entered a VIP section normally, spots a Sim inside who instead sneaked into the section, there's a very small chance for the normally entered Sim to be become Nauseous.	&EP03	0.83%
Losing At Dance Sphere	If a Sim attempts using the Dance Sphere and fails, the Sim can get nauseous.	&EP06	25%
Winning at Dance Sphere	Even when winning when using the Dance Sphere is there a small chance listed to become nauseous.		5%
Alchemy Failure	While attempting to mix an alchemical elixir, a Sim may occasionally fail and receive the "Nauseous" moodlet instead.	&EP07
Eating Poisoned Apple	When the "Deep Slumber" 2-hour moodlet expires, the Sim gets the Nauseous moodlet immediately afterwards.		100%
Ad Nauseam Elixir	Throwing or drinking the "Ad Nauseam" elixir will give the target Sim the Nauseous moodlet.		100%
Tummy Twister	If a fairy casts the Tummy Twister trick, there's a 20% chance that the affected Sim becomes Nauseous.		20%
Being Near Plagued Sim	If a Sim with both Pestilence Plague and low Hygiene motive coughs near the Sim, the latter Sim has a high chance of becoming "Nauseous".		18%
Eating a Jelly Bean	A Sim who eats from a jelly bean bush has a small chance of getting the Nauseous moodlet as the result, or to get Oddly Powerful (which in turn has a 50% chance of resulting in nausea).		3.83%
Zombie Eating a Plant	If a zombie succeeds in eating a harvestable plant, the zombie can get the Nauseous moodlet by it.		20%[note 3]
Eating Contest	There is a chance Sims will get the Nauseous moodlet after participating in a table-based Eating Contest.	&EP08	30%[note 4]
Watching Eating Contest	Sims watching a table-based Eating Contest also have a chance of becoming nauseous.		5%
Alien Test Subject Job	When an alien has finished a work day at the "Alien Test Subject" part-time job, they can become Nauseous.		20%
Alien Abduction	When a Sim who has been abducted returns back to ground, one of the 4 possible moodlets they can get will be the "Nauseous" moodlet.		25%
Exiting Haunted House	It is known to be possible for a Sim to get nauseous after having finished a visit in the haunted house.		8.33%[note 5]
Be Medical Test Subject	Choosing to be a medical test subject at the Busche School of Science will get one of 3 possible moodlets, one of which is Nauseous.	&EP09	33.3%
Drink New Glunka	If the Sim receives a New Glunka can from a drink vending machine (which has a circa 14.13% chance to happen), a Sim who then drinks the resulting drink has a considerable chance of getting nauseous.		65%
Seasickness	When a Sim does not have the "Sailor" trait and is on a houseboat for a long amount of time.	&EP10
Dirty Resort	If the game considers a resort to be particularly dirty at the time, all non-staff Sims on the resort lot can become nauseous no matter where they are on the lot.
Eating Evil Mermaids' Fake Mermadic Kelp	If a mermaid gifts a non-mermaid Mermadic Kelp, but the mermaid has the Evil trait (most notably Salty Seaworth), eating the fake kelp will not turn the Sim into a mermaid and will instead make the Sim Nauseous.		100%
Time Travel	Sims can sometimes get nauseous as they travel through time with the Wellsian Time Portal.	&EP11	0-13.33%[note 6]
Flight Sickness	Sims have a chance to get the Nauseous moodlet when they fly around with a jetpack.		0-90%[note 7]
Eating Low-Quality Bugs	After having been in the Dystopian Future and learned Bug Eating, eating insects of very low stock value, especially cockroaches, has a substantial chance of making the Sim nauseous.
Vibrating Heart-Shaped Bed	After turning on the bed's vibration function while relaxing on it, the Sim can sometimes become nauseous afterwards.	&SP01	30%
Overeating at gumball machine	If a Sim eats 10 gumballs within an unknown short timespan will become nauseous, they will get the Nauseous moodlet. Should they continue eating gumballs after having vomited, they will not become nauseous a second time.	&Store	100%
Eating from Dirty Ice Cream Maker	If a Sim eats an ice cream obtained from a visibly stained and dirty ice cream maker, they will usually become nauseous.
Tricked by The Hypnotizer	If a target Sim has been hypnotized, and the caster then tells the target to do a hypnosis-related action, there is a chance the caster can snap out in the midst of being told to do it, so that the caster instead turns their own attention on the spinner. This has a chance of making the caster vomit and then become nauseous.
Karma Powers	The Bad Karma powers "Cosmic Curse" (PlayStation 3 and Xbox 360 games) and "Nauseate" (Nintendo 3DS games) has nausea as one of the target Sim's symptoms.		100%

Notes

Virtual Nausea

Virtual nausea is a variation of the regular nausea. Sims can become the "Virtually Nauseous" moodlet when they're using the SimLife Goggles too much. It is possibly based on the real life virtual reality sickness.

Nauseous (Pet)

In The Sims 3: Pets, dogs and cats are known to get nauseous in much the same way as a Sim does, but with a different icon.

The Sims 4

In The Sims 4, nausea works similar to in The Sims 3, but is divided into 2 steps of 1 hour each. The first moodlet will state that the Sim's stomach is upset, while the second one will imply the Sim is ready to vomit. Sims have a 50% chance of vomiting before the second moodlet expires. If the Sim vomits, they will run to a toilet, but if there's no toilet nearby or the nauseous Sim is in the middle of performing a task, they will vomit on the ground. In The Sims 4: Get Together, Sims may run to a party bush to vomit. As soon as the Sim vomits, the Nauseous moodlet will go away.

Squeamish Sims have the option to take deep breaths, which will cure their nausea instantly.

Sims can experience nausea for various reasons, such as:

Cause	Description	EP	Chance
Morning Sickness	From pregnancy.	&BG	100%
Eating Spoiled Food		&BG
Eating Meat	Vegetarian Sims become nauseous after eating food that includes meat.	&BG	100%
Consuming Dairy	Lactose intolerant Sims become nauseous after eating food produces that include milk or similar.	&BG
Getting Into Fight	Squeamish Sims become nauseous if they get into fights.	&BG
Witness Death	Squeamish Sims become nauseous if witness another Sim dying.	&BG
Seeing Another Sim Vomit	Squeamish Sims become nauseous if witness another Sim vomiting.	&BG
Privacy Intrusions	Squeamish Sims become nauseous if they for instance get walked in on while sitting on the toilet.	&BG
Creepy Crawlies	Squeamish Sims become nauseous if they for instance fish or are searching for frogs.	&BG
Final Exam Anxiety	There is a chance for a Sim to become nauseous one hour before class time in anticipation of the final exam, along with the “Cram for the Exam” +2 uncomfortable moodlet (May also receive +2 tense of the same moodlet in some circumstances).	&EP08
Eating Normal Food	Vampires with the "Withered Stomach" weakness will get this from eating normal food; this also enables them to vomit into a toilet at will.	&GP04

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The Sims Medieval

In The Sims Medieval, drinking 6 drinks in a relatively short timespan will make the Sim nauseous. It seems to work the same way as in The Sims 3, but the Sim takes 1 hour before vomiting instead of 2 hours.

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