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Why Do Joints Pop And Crack?

21461 ratings | 1142640 views
SciShow explains what really causes those popping sounds your joints make -- fluid dynamics, people! -- and what you should watch out for if you're a habitual knuckle-popper. ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/artist/52/SciShow Or help support us by subscribing to our page on Subbable: https://subbable.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Thanks Tank Tumblr: http://thankstank.tumblr.com Sources: http://www.scientificamerican.com/article/what-makes-the-sound-when/ http://cal.vet.upenn.edu/projects/saortho/chapter_86/86mast.htm http://www.loc.gov/rr/scitech/mysteries/joint.html http://health.howstuffworks.com/human-body/systems/musculoskeletal/question437.htm http://www.hopkinsmedicine.org/healthlibrary/test_procedures/orthopaedic/joint_aspiration_92,P07680/ http://www.livescience.com/9729-knuckle-cracking-ig-nobel-prize.html https://secure.flickr.com/photos/orijinal/4740214235
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Text Comments (2138)
Data Wargaming (1 day ago)
I can crack both of my thumbs for 100s of times within seconds of each other (I've tried, and yes they go for ages)... mucho confusiono
Ethan Hauff (2 days ago)
is that a castle story shirt?!?!?! nice
A C (5 days ago)
i can also crack almost every joint
Josh Guyette (1 month ago)
I so did NOT need to know this. :)
LazyLife IFreak (1 month ago)
I can attest personally that popping/cracking your joints is the fastest method of being directed to the nearest dentist, chiropractor or emergency ward.
Ricky Thomas (3 months ago)
Is this the same thing that happens when cracking your back? Or does that work differently? :P
dmcepeda (3 months ago)
2:00 how do you do that?
Shrimp Bisque (4 months ago)
My dad always hated the sound of cracking knuckles. For some reason, he thought the crack meant you were actually breaking your bones. I was never able to convince him otherwise, despite the obvious lack of excruciating pain. My dad was... pretty stupid.
john sims (4 months ago)
don`t waste my time dipshits
Health Victory (5 months ago)
How synovial fluid generates in body Can you explain it
Snehanshu Phukon (5 months ago)
The content of this video is more or less same as https://youtu.be/IjiKUmfaZr4
Michael L (5 months ago)
not everyone can crack their joints, lucky😣
Lapis Lazuli (5 months ago)
I just realized how capital F, Fine he is lmao. But this makes me feel better because I used to habitually crack my knuckles. Not so much anymore but the old wives tale about getting arthritis did bug me.
Rachel Ronoldo (5 months ago)
1:54 hOtt
Halloween Novalest (5 months ago)
I just love cracking my knuckles near people that hate the sound and watching them cringe and squirm around in disgust and unpleasantness.
Sapphirous Raynes (5 months ago)
That evil look in your eyes before you pop your neck.
anna blue (5 months ago)
I was lying in fetal position but I just planked
siradams (6 months ago)
. (7 months ago)
I thought the thumbnail was two people banging. I’m gonna sleep now.
Night Skyler (7 months ago)
welp i was told to press 8 now i cant stop myself
I really don't understand these comments...
Ech I hate the sound, it reminds me of breaking bones... (Have I watched too many surgeries?)
Courtney Costanza (8 months ago)
So why does it feel so good to crack them?
Chiasa Takahashi (8 months ago)
Okay, I can keep cracking my fingers then :D
Magmakaj30 (9 months ago)
Mary Barr (9 months ago)
It feels so good, my fav is cracking my shoulders and back twists.
Keep it 1000 (9 months ago)
That neck crack was fake it was bubble wrap
Jack Frost (9 months ago)
1:54 "I beg to differ" *looks you dead in the eye while popping neck* I just keep laughing and replayed that part
RUNSHOOTKILL09 (9 months ago)
I can crack my fingers over and over till I get tired just by squeezing my fist why is that ?
GORE illa (9 months ago)
Joint and crack... Hm...
theblackdeath357 (10 months ago)
Can you (enjoyably) crack your knee?
Christine Cannibal (10 months ago)
why does cracking or popping joints feel so good? and why do some people hate the noise while others like it?
Horsepowahhh (10 months ago)
my toes won't stop cracking! whenever I walk!! is there a way to stop this?
M-Square Parkour (10 months ago)
I can po every single one of my joints.😁
Levi Strauss (10 months ago)
My knees crack like crazy. Sometimes when I'm going up stairs or just walking. And I mean like every step.
Randood The random dude (10 months ago)
Dat satisfying pop doe
ScienceWithJames (11 months ago)
1:54 I think i just blacked out...
Elijazfraz Elsassafraz (11 months ago)
Castle Story anyone?
Joshua van Zyl (11 months ago)
I en joy cracking my nuckels, toes, ankels, knees and back, i dont crack my neck anymore because after is started doing it my neck started becoming sore and when i stopped the pain left, but i have no problem with the other joints lol
Mr Fish (11 months ago)
Wearing surround earbuds/headphones while he cracked his neck made it sound so weird
Jesus Da lawd (1 year ago)
Weaker grip strength explains alot :/
The Seleuf (1 year ago)
What if some alien communicated by join cracking?
Vaulted D (1 year ago)
I can crack my elbow and wrist immediately over and over again whenever I want it's weird I can do it for hours but get headaches whenever I do and can sometimes fell something rubbing on my skin and get immense burn pains in my wrist after doing it for awhile help me
Because I'm a fan (1 year ago)
That neck crack at the end scared the crap out of me!! It was so much louder than the rest of the video. And it's late at night. And I'm wearing headphones. #Excuses
Because I'm a fan (7 months ago)
Rewatching this, vaguely remembered the *oh sh--* the giant neck crack is coming! And I yanked out my headphones just in time. (shakes fist) Dangit, Michael!!
István Sipos (1 year ago)
I'd rather hear a knife on glass or fingernails on a chalkboard. those simpy have no effect on me but this is unpleasant
Thermal_Sniper X (1 year ago)
When ever i crack my knuckles I go into a laugh which I cannot stop that’s why I don’t crack my knuckles
Suzanna Natelli (1 year ago)
what I would give to crack my neck like that! 8 months of pregnancy and not once have I been able to crack my back or neck and it's killing me :/
Orion-Nebula42 (1 year ago)
Fun fact: I cannot crack or pop ANY of my joints
I can crack my ass. no seriously, by moving my core body and leaving everything from the waist down still, my waistbone makes a popping sound. then 15 minutes later my waist makes a sound similar to when my stomach growls.
Stefán Örn (1 year ago)
I love making people uncomfortable by doing that XD Although I can mostly only do it with my neck my sister can do it with her toes but it's unintentional cause it happens when she walks and she says sometimes everytime she takes a step it makes the cracking sound
DeltaX (1 year ago)
I can pop my right wrist over and over
Shanz (1 year ago)
thought this was about weed lol
Kaitlyn Robb (1 year ago)
I had headphones on Not cool 😜
rusty the templar (1 year ago)
That last part was oddly satisfying to hear
Grantzow (1 year ago)
i can crack my finger joints all the time
Nashee Justice (1 year ago)
he said you cant crack the same joint over and over again because the gas needs time to dissolve again. I can smoke many joints at the same time. Just light them up and give me more flavor!
atari460 (1 year ago)
Next SciShow QQ: Why does anyone hit the dislike button on your videos?!
deanampora64 (1 year ago)
Why did i watch this when i knew that he was going to crack his knuckles
The Cat Ate My Shoe (1 year ago)
I can't voluntarily crack any of my joints. They can, however, crack themselves at the most inopportune times.
ordinary Oddball (1 year ago)
But why does cracking your knuckles feel good or satisfying?
keyqueen (1 year ago)
how did he do that
Sunforged (1 year ago)
Watching these types of videos makes me feel weird. Like watching this made my joints feel funny.
Jessie Medina (1 year ago)
What a nerd omg
Ayenate' Lawson (1 year ago)
I haaaaaate those sounds 🤢
TCOrigamist (1 year ago)
nothing more satisfying than a good neck pop
hopeworld jhs (1 year ago)
when a 2 minute long video is more useful than 2 hours worth of pe theory lessons on joints
MR Potato (1 year ago)
i can crack my foot over and over again no matter what
Powner 42 (1 year ago)
I can crack my right wrist over and over for as long as i want. Ive gone 5 mins straight
Hanif Huzairi (1 year ago)
If I don't crack my spine by twisting it to either side within 24h after the last time I did so, the popping sound comes as such a huge relief.
Rice Krispy (1 year ago)
holy shit was that neck crack real I full-body cringed
hoffmakg 667 (1 year ago)
i watched that first finger popping like 8 times, so damn satisfying.
DigBipper188 (1 year ago)
251 people cringed watching this video lel
Drunk Chara Dreemurr (1 year ago)
i van crack my hand joints continously on my right hand but not my left BUT i can crack BOTH of my fingers in midair(not technically, what i mean is that i dont have to pull or put pressure on my fingures. I can just crack them whenever i want and continously) on both hads
That neck crack was fake.
El Patey (1 year ago)
if the bubbles take time to dissolve, then why can i crack my right wrist (by clenching my hand & twisting it) constantly for over a min? am i just producing more and more bubbles?
Squirrel Master (1 year ago)
When he cracked his neck I was like YOU WANNA GO MATE I cracked my neck and got probably twice as many cracks and my mom looked over in utter shock and horror needless to say i am quite proud of myself
Perspicacious (1 year ago)
Anyone else protrude their arm outwards to crack their elbow joint?
ecnoid (1 year ago)
Perspicacious yup i doo
Lisa Nicole (1 year ago)
I crack mine over and over again.
T Russo (1 year ago)
Hi Michael, like you said in the video, it feels good; is that because of the 15% (@ 1:15 ) expansion? i.e. More room in the joint?
P S (1 year ago)
My wrists crack at every rotation, and they do hurt all the time. Pretty much constantly. I don't intend to crack them, they just ache, so I rotate them to stretch the muscles and they crack. I'm guessing this is a different kind of cracking than the one described in this video...?
Cassie Pena (1 year ago)
Pearl Carol having your wrists hurt all the time isn't normal you should probably see a rheumatologist
Woody Hulst (1 year ago)
I just posted this above but thought you might wanna read it "The continuous cracks you are hearing in your wrist are caused by the flicking of tendons over other tissue they are getting caught on, such as bones and ligaments (and potentially scar tissue). Hence why you can continuously crack these joints... Wrists, ankles, knees and hips are the most common spots this occurs. From your friendly neighbourhood chiropractor"
Raven Wolf (1 year ago)
I can crack my big toes without breaks, but it isn't satisfying, unlike the rest of my joints cracking
Eirikr Hernández (1 year ago)
I know this is a slightly old video but. Can I put up spanish translated subtitles? (I hope the comment gets to be seen lol)
Konrad (1 year ago)
My only question would be why I can crack my wrist without any breaks in between? Whenever I crack my neck, arms, back, etc. I can only do so once every 30min or so, but when it comes to my wrist it just keeps cracking as I twist it
Riley Poole (1 year ago)
I think I know what you are talking about. I can do that too. I think it's something different. I think in that case it actually is your bones moving against each other or something.
Woody Hulst (1 year ago)
The continuous cracks you are hearing in your wrist are caused by the flicking of tendons over other tissue they are getting caught on, such as bones and ligaments (and potentially scar tissue). Hence why you can continuously crack these joints... Wrists, ankles, knees and hips are the most common spots this occurs. From your friendly neighbourhood chiropractor
Adjuni (1 year ago)
One of my knees does the same when I walk down the stairs.
Beyond Lorien (1 year ago)
I can only crack my wrist once just like my fingers and most other bones in my body but I can repeatedly crack my shoulder and sometimes my elbow.
Conman_123 (1 year ago)
Me too
Tad Meister (1 year ago)
gotta fuckin do it
eeveelover416 (1 year ago)
I can continuously crack my middle finger. I don't know why...
Cassie Pena (1 year ago)
eeveelover416 over use :p
zach gregory (1 year ago)
I can infinitely crack the middle knuckles on my right hands middle 3 fingers. I doesn't hurt but people think it's creepy.
Dick Scruttocks (1 year ago)
If it's not Hank, I don't watch.
user name (1 year ago)
If its not aranda i dont watch
HappySporks (2 years ago)
They called me crunchy 😂😂
I had issues with my SC joint. I don't know why I developed it but I noticed I am having pain every now and then in that area but once I raised my shoulder upward and it popped the pain is gone. I thought it also causes pain in my right buttocks but once I popped my shoulder, the pain in my buttocks disappears as well. What do I need to do to prevent it? Please help.
lolguy trolguy (2 years ago)
Daniel Tamayo (2 years ago)
I thought this was about weed joints making cracking and popping noises lol
Inferno Prime (2 years ago)
heey i can crack almost every joint too! even the pinky finger on my leg sometimes
RukiahTaicho (2 years ago)
My spine tends to shrink a bit, sometimes reducing my height with two or something centimetres. I often need my brother to straighten it for me, so he essentially lifts me by holding me around my chest, lifts and then shakes me so that my spine straightens out with a series of popping sounds, similar to what happens when you pull at a bendy straw. It's the best feeling in the world!
Vatra (2 years ago)
I have several joints that can pop all the time. My left wrist can and does pop every time I move it in a certain way. If I twitch my wrist in that certain way it pops indefinitely. My neck pops a lot too, but that's different. I got in a car accident that did some damage to my neck, now it constantly builds up tension, and the only way to relieve it is to crack my neck. It typically pops approximately 20 times an hour.
Do I care tho (2 years ago)
im a habitual everything-popper
Neo T (2 years ago)
I can pop the big toe on my left foot constantly with out breaks
TT Rey (2 years ago)
my grip is very powerful and I pop my knuckles all the time
Heather Garner (2 years ago)
if u pop any point under water it sounds so nasty almost gut wrenching
How does the atomic weight of an atom result in the properties of a material such as color?
Bea Troon (2 years ago)
this made my day. Cracking my joints is my favourite thing to do, ever.
Mazaroth (2 years ago)
Neck popping is fucking awesome, i mean yeah, it hurt the first time i did it but oh man, it feels satisfying as hell when i do it. i can also pop all the joints in my fingers and both wrists. But what is the most pleasurable one is popping my back, i do not know how many joints i can pop back there, but its the upper joints that do the most popping. Also, my ankles pop all the time when i just turn them with their own power.

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