Articles, Blog

Why Do We Vomit?

November 13, 2019

Roller coasters. Bad sushi. Public Speaking.
All things that make you puke. But why? Hey guys, Chastity here for DNews. We’re gonna be tackling your science questions
every Monday. This week’s viewer question comes from Sam Litsas, who asks, “How/why
do we vomit?” Great question, Sam. Unfortunately, there’s
no short answer to why we puke. As I’m sure you’ve all experienced, vomiting
is an involuntary expulsion of your stomach contents through your mouth and sometimes
your nose. Ick. Even though it’s gross, it’s actually
a good thing! Because vomiting defends you from being poisoned. The part of the brain
that manages poison control is called the area postrema. This part is exposed to the
bloodstream, allowing it to scan for toxins. When a toxin is spotted, like as a result
of one too many tequila shots, the area postrema tells the body to purge the stomach. When you vomit, several things happen to your
body at once. Your blood moves to your internal organs, causing your face to lose color. Your
teeth are coated in saliva to shield them from your stomach acid. You break a sweat,
your blood pressure drops, your heart races, and you start to breathe faster as you retch.
The large muscles of your respiratory system reverse the path of your digestive tract,
turning you into a human geyser. It’s uncomfortable, involuntary, and a big ol’ mess. But it’s
also a unique ability! Other than humans, there are only a few animals
that can vomit, like cats and dogs. Mice and other rodents, however, can’t. Neither can
horses. Rodents lack the key neural circuits that tell the stomach to purge. They also
have a powerful seal that separates the esophagus and the stomach, which cannot open. That explains
why rat poison is so effective. Horses also have a strong band of muscle around
the esophagus. It operates as a one-way valve as it enters the stomach. Food can go down
into the horse’s stomach as this valve relaxes, but the valve squeezes down on the opening,
preventing food from going back up. So why do people vomit? The list of causes
is lengthy: Drinking too much alcohol, Prescription and nonprescription drugs, Food
poisoning, or viral infections that inflame your gut and cause severe stomach pain. Throwing
up can also be triggered by your stomach’s nervous system telling you it’s too full. Feeling afraid or disgusted can also make
us nauseous. If you’ve ever puked during a gory movie or at the sight of blood, it’s
because the unpleasant visuals stimulate nausea. These visuals cause the limbic system in your
brain, which controls emotions, to feel distressed. This distress causes the autonomic nervous
system, which controls internal organs, to tell your stomach to purge. So even though
you’re not really exposed to a life-threatening poison, your body has a hard time differentiating
emotional and physical stress. In either case, it reacts the same way. One of the things that makes me nauseous is
air travel. Why does flying make us feel sick? Julian answers that in this video.


  • Reply Kyle Graybill March 20, 2019 at 5:32 pm

    I just vomited and it is nice to know that it is ok but why when we have the GI bug we throw up multiple times🤮

  • Reply Andy Fishman March 22, 2019 at 10:57 am

    I vomited last time cuz I got a stomach virus

  • Reply Andy Fishman March 22, 2019 at 10:58 am

    I vomited last time a long time ago
    But I was not poisoned 😃

  • Reply Andy Fishman March 22, 2019 at 11:02 am

    Don't eat raw cookie dough nausea or vomiting🤢🤒

  • Reply Richard Tompkins March 23, 2019 at 2:41 pm

    how come horses dont puke?

  • Reply Cosmo Theory March 26, 2019 at 5:58 pm

    Kicked at the balls makes you vomit

  • Reply crunchwrap supreme March 27, 2019 at 5:29 am

    I’m curious to know as I had 7 Budweiser’s to myself, multiple shots of different types of liquor at my buddy’s party and threw up that night, and also the next morning at home. I had just eaten a cup of mr noodles and drank cold water and around 3 minutes later I puked up this disgusting tasting cold watery vomit. It sucked ass.

  • Reply JokerThePhantomTheif March 27, 2019 at 6:35 am

    Dose vomiting hurt

  • Reply ˢᵀᴱᵛᴱᴺ ᵁᴺᴵᵛᴱᴿˢᴱ March 28, 2019 at 4:33 am

    Sorry for the inconvenience, but you make me discussed.

  • Reply CABBAGE MEMES March 30, 2019 at 2:48 am

    Rip Discovery news

  • Reply khashmee ousside March 31, 2019 at 3:15 pm

    trying to overcome my fear (emotophobia) watching all of these videos but ended up at the bathroom puking.

  • Reply ThatOne Gamer March 31, 2019 at 8:39 pm

    I never vomited in my life someone tell me what’s wrong with me

  • Reply Alan Smith March 31, 2019 at 11:57 pm

    How you get motion sickness:
    When you are in a car or any other vehicle everything passing by is quickly moving away, when you look your brain is having trouble knowing if you are moving or not ,triggering your nausea 🙂

  • Reply 月泓范木門救 April 1, 2019 at 4:41 pm

    I hate vomiting I'm scared of vomiting, creatures , the dentist and I'm also scared of the dark and I never vomited in school

  • Reply Carloa Salaman April 2, 2019 at 10:02 pm

    Wat do we do wen we vomit

  • Reply giantevilduck April 5, 2019 at 11:08 am

    I had stomach pain for days now I see why I vomited

  • Reply Vintage Prince April 6, 2019 at 12:45 pm

    I ate Bk at night like at eleven and woke up @7 and threw up. Bih nasty.

  • Reply Carie Brady April 6, 2019 at 5:00 pm

    Way do we poop

  • Reply Desna Fleury April 7, 2019 at 7:06 pm

    Why do we get sick?

  • Reply Kendall Jenner April 15, 2019 at 3:09 am

    Why do i feel like vomiting when being to much in the sun and also the lights at home?😰😷😷😵😵

  • Reply Pøtatø Sunfløwer April 16, 2019 at 1:04 am

    I TᕼᖇEᗯ ᑌᑭ Iᑎ TᕼE ᗷEᗪ OᑎᑕE ᗩᑎᗪ TᕼEᑎ I ᗯᗩᔕ ᒪIKE ᖴIᑎE! Iᒪᒪ ᔕᒪEEᑭ Oᑎ TᕼE ᖴᒪOOᖇ TᕼEᑎ

  • Reply We Are Weebs April 16, 2019 at 5:31 pm

    Boku no pico

  • Reply Alex Sherr April 18, 2019 at 2:36 am

    So, I threw up maybe 4 times when I smoked weed for the first time. The people I smoked with told me that it was just because I had smoked too much. Is this true? Has this happened to other people?

  • Reply DizZxClapz April 20, 2019 at 4:54 am

    Good thing the last time i threw up was 7 years ago

  • Reply Syed sufiyan April 21, 2019 at 10:24 am

    Why/we feel like we about to vomit but we cant vomit

  • Reply Emma Grace April 27, 2019 at 2:31 am

    Me feeling like vomiting or if I see people vomiting I have such a bad anxiety and panic attack 😔

  • Reply Jp Doran April 27, 2019 at 7:45 pm


  • Reply SoundCloud Rapper's April 30, 2019 at 3:29 am

    I am trying to puke right now but I cant I don't know why but I was very nervous to about something and I wanna puke because I can't sleep

  • Reply Max Willson April 30, 2019 at 5:35 am

    Way too much beer and whisky last night. Never doing that again. I woke up blowing chunks all over my bed. Not a fun experience. I can't hold in my alcohol like I could in my early 20s. I sound like an old man but I enjoy my sober nights a lot more than my drunk nights now.

  • Reply follow your heart May 9, 2019 at 6:58 am

    Every time I woke to 2 clocked in the morning I feel throw up

  • Reply Exitz X May 10, 2019 at 3:13 pm

    I just pukes 3 times in a row

  • Reply Mr. Beardy May 11, 2019 at 9:48 am

    vomit stinks when we burp

  • Reply lexis firestine May 12, 2019 at 6:56 pm

    I'm shaking so much I don't wanna throw up

  • Reply Okoboji May 21, 2019 at 3:32 am

    As a kid, throwing up 🤮 used to scare me to death. It was (and still is) a very unpleasant involuntary function that I have no control over whatsoever, and that’s what scared me about it. Even the imminent threat leading up to throwing up is scary.

  • Reply Kausher Irsaad May 27, 2019 at 7:10 am

    Speak little slow

  • Reply Kausher Irsaad May 27, 2019 at 7:11 am

    Everything is like learned just reading

  • Reply Fernando Moreno Hernandez May 28, 2019 at 12:35 am

    like si estas aqui por el video del ded XD

  • Reply Grace Elizabeth May 28, 2019 at 4:58 am

    To the people who HATE vomiting, yes it’s not an enjoyable experience but it’s not the worst thing in the world. I always feel better afterwards so that makes me want to do it. The second I feel like throwing up, I run to the bathroom and force just to get it over with. No need to be scarred

  • Reply Mario's Great adventures May 28, 2019 at 7:13 pm

    I haven't vomited in 4 and 1/2 years. Ive tried to throw up but I just end up gagging, is that normal? Im pretty happy though.

  • Reply UWU gacha May 31, 2019 at 12:58 am

    I hate vomiting it make a weird feeling in ur trought

  • Reply Gabe Chairez June 8, 2019 at 11:50 am

    just threw up Takis burrito and 2 pizzas wassup

  • Reply BREATH June 9, 2019 at 5:50 am

    I kinda like vomiting because when im done i feel reliefe if i am sick but better not happen

  • Reply Imagine That June 11, 2019 at 3:43 pm

    Chastity belt

  • Reply jennifer Isabel June 13, 2019 at 2:48 am

    i puke !

  • Reply Phebe Bofay June 22, 2019 at 9:25 pm

    I just came after vomiting 4 times 😥

  • Reply Neon _nightfall June 23, 2019 at 9:20 pm

    For some reason my docter said I cant puke I thing its a birth defect

  • Reply Emelia Hamill June 24, 2019 at 8:17 pm

    1.why do we get sick
    2.why is ther such thing as sick
    3.why do cats puke up hair balls

  • Reply Sub to Ronnie hubTTV June 26, 2019 at 8:07 am

    I wish I was a mouse or horse

  • Reply IceFox_FireFox June 26, 2019 at 11:21 pm

    Who else hates waking up in the middle of the night for no reason, and then soon you start worrying you are going to feel naesous?

  • Reply Linda Ionela Ceausu June 28, 2019 at 3:38 pm


  • Reply seasonofjordyn TM July 3, 2019 at 12:09 am

    I just threw up my Doritos….

  • Reply Waleed Tabraiz July 5, 2019 at 12:25 am

    No why do women puke during pregnancy?

  • Reply Leo Haro July 10, 2019 at 1:29 am

    I almost threwup when o went to the dentest today

  • Reply Mai Khanh July 13, 2019 at 6:02 am

    I remember eating something bad and then drink some pills after and after I vomit the bitterness of the pills still last in my mouth for more than 15 minutes or so

  • Reply Eunice July 13, 2019 at 10:32 pm

    After I puke, I brush my teeth. Am I the only one?

  • Reply Cody Stone July 14, 2019 at 1:44 am

    I love the feeling of this

  • Reply DJ SuperemeGoddies101 July 14, 2019 at 9:03 pm

    Why do have diarrhea?

  • Reply DJ SuperemeGoddies101 July 14, 2019 at 9:05 pm

    Why do get dizzy/faint?

  • Reply Evy Rose July 16, 2019 at 4:59 am

    I just puked 3 times a day

  • Reply Foxy Productions! July 17, 2019 at 11:55 pm

    I vomited because I had a cold and when I shit it is water not solid

  • Reply Stormy 101 July 18, 2019 at 1:11 pm

    Y'know when you have to barf and think you'll feel better after u do so u do. But then after you puke you still feel bad and realise you probably have a stomach virus. Yeah…me rn

  • Reply Zorra Smith July 19, 2019 at 6:22 am

    I only throw up like once a year. And it's isn't much.

  • Reply RocketPlayz 58 July 20, 2019 at 6:02 am

    Who is scared of vomiting? Cuz i know i am scared because i loose alot of air and dont feel like it

  • Reply Manjula reddy July 23, 2019 at 2:46 am

    Why do we get eye pain

  • Reply Laugh Maker July 25, 2019 at 4:12 pm

    When I first watched titanic I pucked

  • Reply Tundra July 25, 2019 at 5:27 pm

    I saw person flipping tortillas and I puked. It’s not a good day.

  • Reply Cclay21 Bryan July 25, 2019 at 8:51 pm

    I agree throwing up make u feel a lot better, but what I hate the most is throwing up nothing it’s so painful for me

  • Reply oof mode July 29, 2019 at 3:26 am

    Oh I drank too much water, thanks.

  • Reply florina vinu July 30, 2019 at 9:28 am

    I PUKED SO MANY TIMES!!! IN REAL LIFE IN ROMÂNIA!!!!!!!!!!!!!☹️☹️☹️☹️☹️☹️

  • Reply florina vinu July 30, 2019 at 9:29 am

    And now im good!😆😄😄😄😃😃😃

  • Reply Abdullah Albanwan July 31, 2019 at 4:57 am

    I vomited and now it hurts my tummy

  • Reply sakuramoon August 3, 2019 at 5:05 pm

    I only vomit if I eat something that does not please my stomach

  • Reply xXgetbodiedXx XD August 3, 2019 at 10:28 pm

    Lol I threw up last night

  • Reply Aquinata sizwe Mmela August 4, 2019 at 6:38 am

    Where do u puke when u have a bun in the oven

  • Reply Julia Miller August 6, 2019 at 5:18 am

    Why are we scared of clowns?

  • Reply KlauDimond August 6, 2019 at 11:37 am

    im watching this while feeling sick. Cuz yesterday i didn’t eat anything except a potato lazania before bed at 21:00 and a hour ago i ate egg with sead bread and now i fell kinda sick

  • Reply Rise and revolt Fuck modern comforts August 9, 2019 at 4:05 am

    So it takes me 200 pukes and 25 hours to get poison from pre prepared packaged food…

  • Reply AlxxhYT August 9, 2019 at 7:41 pm

    Who is that guy at 0:23 puking?

  • Reply Moz August 11, 2019 at 8:03 am

    Africans (from Africa) do not puke due to nervousness, at least I've never seen such in my life. Has any other African?

  • Reply Pedro Lopez August 18, 2019 at 2:02 am

    I hate voimitng i rather dirra than voimting last time i was at laguna nigel i wanted to vomit than i drank water i mange to not to vomit 😀

  • Reply Alone August 19, 2019 at 2:12 am

    I’d rather shit my brains out than vomit

    Last time I vomited i nearly died because I was choking on my own puke

  • Reply Jadalyn Aguilar August 19, 2019 at 6:14 pm

    I threw up taki’s and it was awful

    Edit: 😤

  • Reply Jau Padariau August 20, 2019 at 11:47 pm

    You can vomit by sadness

  • Reply Jau Padariau August 20, 2019 at 11:49 pm

    What causes drinking pee and eating poop

  • Reply Cody Stone August 21, 2019 at 12:33 am

    I love puking but the taste is horrible

  • Reply truefriend 23 August 21, 2019 at 3:53 am

    why do we have anxiety ?

  • Reply Twili Vaati August 27, 2019 at 4:10 pm

    I havent vomitted for 10 years now

  • Reply •chx ned• September 6, 2019 at 12:50 pm

    and I had just vomited-

  • Reply K September 7, 2019 at 6:48 am

    Just vomited till my stomach is empty. It was terrible but at least my stomach doesn't ache anymore.

  • Reply Gracie Long September 9, 2019 at 3:18 am

    Whenever I puke I never make it to the toilet

  • Reply KlitKlat September 23, 2019 at 4:40 pm

    I remember one time my stomach hurting so much I vomited on the side of my bed and it was so bad the bile got out of my nose

  • Reply KiwiCupcake October 7, 2019 at 1:43 am

    Did you know that your body will make you puke if you are in danger?

    This is to distract the attacker long enough for you to get away

  • Reply fαитαѕтιcαl_ вυrrιтσ October 13, 2019 at 8:49 am

    I haven't puked in more than 5 years

  • Reply fαитαѕтιcαl_ вυrrιтσ October 13, 2019 at 9:01 am

    Who else just hates it when you wake up in the middle of the night and just puke out of nowhere?😬😂

  • Reply Pompom Yourkey October 13, 2019 at 4:51 pm

    I haven’t vomited for 12 years why?

  • Reply MahGuel October 14, 2019 at 6:42 pm

    Bad sushi? I threw up after eating sushi

  • Reply Rick Grimes October 21, 2019 at 6:42 am

    It hurts so bad, I hit the toilet seat when it happens.

  • Reply Scientific November 8, 2019 at 4:22 pm

    Am i unique or something?
    Cause when im hungry i feel nauseous

  • Reply paige osborne November 10, 2019 at 6:23 pm

    I puked up ice cream last night

  • Reply Catpuccino X November 12, 2019 at 5:50 pm

    I haven’t thrown up since I was 4, I’m 13 now.

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