5 Things Your Hair Can Tell You About Your Health

Your hair isn't just something you have to deal with every morning, it's a part of who you are, and there are things it can tell you about your personal health.
Hosted by: Hank Green
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General hair loss:
Patchy hair loss:
Unusual hair growth:
Thicker hair growth:



  1. MsMcmoe


    16 dias atrás

    Hmm, didn't hear it mentioned that a persons' thyroid may be out of balance, or there's a nutritional/vitamin deficiency .

  2. Ginny Kudish

    Ginny Kudish

    17 dias atrás

    My mom has alopecia, and she has no hair at all. I was wondering, is it genetic?

  3. limpnjen


    20 dias atrás

    That first picture of the baby head made my skin crawl.

  4. Mr Niceguy

    Mr Niceguy

    21 dia atrás

    The title doesn't fit to the content. Should be... "5 (interesting) hair conditions"

  5. Maurice Spence

    Maurice Spence

    21 dia atrás

    I noticed I had alopecia areata after a visit to the barbershop. I thought I was aging way fast or something

  6. Rachel Holt

    Rachel Holt

    22 dias atrás

    Shedding more frequently can also be caused by thyroid imbalances

  7. Morris Chen

    Morris Chen

    23 dias atrás

    Thank you for using trans/gender-inclusive language!! This just made me love you and your channel even more (which I didn't know was possible)

  8. Mathew Subritzky

    Mathew Subritzky

    26 dias atrás

    hair loss can be a result of spinning on your head.

  9. Lucia Jayne

    Lucia Jayne

    26 dias atrás

    @sciShow ... about personal health ... what about a video in oil pulling. Is there science behind it?

  10. Michael P.

    Michael P.

    26 dias atrás

    Going through the ninth month of tellogen effluvium, the hair has still not recovered. I've learned my lesson with stress.

  11. Letolz Velostoll

    Letolz Velostoll

    27 dias atrás

    "menopause can affect someone's..." you can tell "menopause can affect a woman's..." is being avoided, because men can undergo menopause now.

  12. Nightshade Kelly

    Nightshade Kelly

    27 dias atrás

    Why does hair grow long on your head but not your arms and legs

  13. Nightshade Kelly

    Nightshade Kelly

    27 dias atrás

    Im 16 and have gray hair

    • Lio Jio

      Lio Jio

      25 dias atrás

      more like 61

  14. Nightshade Kelly

    Nightshade Kelly

    27 dias atrás

    If goku or vegetas hair fell out it would be a nightmare

  15. Professsor


    27 dias atrás

    My scalp is itchy...

  16. Elly Arrow

    Elly Arrow

    28 dias atrás

    Omg, bio female... as in opposed to what... artifical females?? O.O

  17. -


    28 dias atrás

    One time I suddenly developed alopecia barbae which caused a small, circular bald spot in my beard (which was still visible even after shaving because it was completely hairless) and it was caused by stress and went away after a while.

  18. chad x

    chad x

    29 dias atrás

    Right. So leave it to your incompetent doctor.

  19. Hypatia Ravenclaw Sklodowska

    Hypatia Ravenclaw Sklodowska

    29 dias atrás

    "your hair isn't just something that you have to deal with every morning" - first time someone accurately described hair imo

  20. Rug46


    29 dias atrás

    Where are my fellow red hair bois :P

  21. Luka Cvitkovic

    Luka Cvitkovic

    29 dias atrás

    Ah yes, seborrheic dermatitis, a simple spell, but quite unbreakable

  22. DaBlondDude


    29 dias atrás

    Nice disclaimer lol, though kinda sad it's needed

  23. Nishant Sengar

    Nishant Sengar

    Mês atrás

    Nicely explained, but what causes premature greying of hair, can that be treated? I have seen even the 5 years old kids start to have grey hair.. is it all diet dependent?

    • Nishant Sengar

      Nishant Sengar

      26 dias atrás

      +gingergamergirl98 I thinks it's more to do with your diet, especially if it lacks vitamin b6, b12 and D..

    • gingergamergirl98


      27 dias atrás

      Nishant Sengar AFAIK it’s genetic

  24. Jeremy Pickett

    Jeremy Pickett

    Mês atrás

    Too many comments way funnier than me :) Thank you Sci, this happens to the best of us and shouldn't be feared. I had a severe health thing, three months later my hair fell out, three months after I am back to normal. Well, normalish :) Talk to your doc, and we dont judge.

  25. Paul Sutherland

    Paul Sutherland

    Mês atrás

    He said "give you a heads up."😛🤤

  26. blub232324


    Mês atrás

    2:20 looks almost like Matt Parker :)

  27. edi


    Mês atrás

    Why are men and women storing fat differently. What´s the advantage of storing it mostly in the belly, rather than spread over a wider area? Since, we´re already on topic: why do many Afro-american women have butts that seem to defy gravity (not sagging, less bouncing and no moon-surface)?

  28. Nikki Williamson

    Nikki Williamson

    Mês atrás

    My hair started falling out in 2017. It happened because I was very ill and on a lot of medications. I got better, came off the meds and it started to grow back thicker. Now I have a tonne of baby hairs that aren’t yet long enough to tie up but are long enough to get in my eyes...

  29. Peldyn - Life with Cats

    Peldyn - Life with Cats

    Mês atrás

    I had a telogenic event and it was scary! Happened after I had a thyroidectomy. Lost most of my hair. Thankfully once my thyroid meds were adjusted my hair grew back.

  30. IncontrovertibleTruth


    Mês atrás

    Well many people look up things on the internet first because at least in America so many people can't afford health insurance also people want to be educated about what's going on with their bodies

  31. TheSzyko


    Mês atrás

    Please make a video about why your turn down the music volume when backing into a parking lot ( and what science is behind it). Yeah for sure it´s because of focus, but why does everyone do it? Maybe there is more to it. Much love, thx for your show!

  32. X3DN


    Mês atrás

    My hair is bleached and colored

  33. Gibraltar


    Mês atrás

    Duuude my hair is so long and I am a boy....my hair is longer than 80 percent of my female class mates.

  34. Ibolya Szijgyarto

    Ibolya Szijgyarto

    Mês atrás

    Traction alopecia *cough*Jojo Siwa*cough*

  35. veksu9


    Mês atrás

    Dandruff is caused by fungus. In special shampoos there are ingredients which kill those microorganisms. You are missleading people...

  36. Jamail44


    Mês atrás

    I have really really bad dandruff, even if I wash my hair.

  37. Sharon Johnston

    Sharon Johnston

    Mês atrás

    I actually have alopecia areata I always thought it was stress related. My dads a barber and in barber college he learned about hair disease and the way hair grows and he told me what it was and that it’s mostly stress related and it’ll grow back so I never really looked in to it I mean it’s probably only happened like 4 or 5 times in 3 years.

  38. That Sagittarius Girl

    That Sagittarius Girl

    Mês atrás

    And here I am with my trichotillimaniac hands

  39. pyukumuku 95

    pyukumuku 95

    Mês atrás

    My hair told me it was too hot so i cut it off. Im bald now.

  40. David Oh

    David Oh

    Mês atrás

    I’ve noticed that ever since I started growing my hair longer, I’ve been losing a SIGNIFICANT amount of hair daily. I’m a male. Does anyone know why?

  41. Chapter Eleven

    Chapter Eleven

    Mês atrás

    me, with an oily scalp and dandruff: sigh

  42. Feral Crafter

    Feral Crafter

    Mês atrás

    Every time I go to a doctor, I'm billed thousands of dollars for a diagnosis of "I don't know" .... Sooo why go to a doctor?

  43. Ico


    Mês atrás

    Sometimes I get extremely stiff, translucent hairs on my arms (only ever noticed it on my arms) that are very easy to pull out and sometimes there’s are multiple coming from the same follicle. Does anyone know what this is or what causes it?

  44. Rachel Swanson

    Rachel Swanson

    Mês atrás

    I have dandruff. It started around 12 years of age. I've tried all kinds of dandruff shampoos none work. I have to only shampoo my hair once a week sometimes twice. I use shampoos for Africans because they're not as drying on my scalp. I also have to oil my hair once a week to two weeks. My son whose reaching 12 years old just developed dandruff too. I think its a hormonal thing rather than a fungus thing as you mentioned. Why would it only start around the time hormones change in a person's body? I'm so tired of dealing with dandruff.

  45. John Smith

    John Smith

    Mês atrás

    8:24 "All sexes"? Seriously? You're a scientist. You know better.

    • zacharymli


      Mês atrás

      John Smith They are using very precise language to describe exactly what they are referring to in each case they refer to sex, gender, or biology. When they say all genders they are including humans who are intersex, because the thing they are referring to is equally applicable in everyone’s case. Science is well aware there are more than 2 biological realities.

  46. TheMeganano


    Mês atrás

    I've been pretty self conscious about my hair ever since I was small. I've always had white hairs and I dunno why...

  47. Lucky


    Mês atrás

    I am 10 and have a long white hair and my friends say it’s cool but ain’t my opinion

    • zacharymli


      Mês atrás

      Lucky Like one hair, on your head? Sounds kinda neat to me, but if you dislike it just pull it out. It may grow back sooner or later, and for some reason white hairs can seem to grow way quicker than any other hair, but you can just pull it out again. No big deal.

  48. paul mryglod

    paul mryglod

    Mês atrás

    Mine is abandoning my head. What does it know?

  49. BeUnotATVrobot


    Mês atrás

    Actually 6, that also you are a brainwashed TV Robot

  50. Michael Seydor

    Michael Seydor

    Mês atrás

    Thanks SciShow for talking about alopecia areata. I have alopecia universalis which is a form of AA with total hair loss over the entire body. AA is one of the least understood and under-researched autoimmune disorders out there since there is no physical pain/restrictions. However, the negative psychological and societal effects can lead many of us to develop mental illnesses among other side effects. Any coverage on our disorder is appreciated as we collectively are trying to create awareness to fast-track research and clinical trials. Woohoo!

  51. 69ouroboros69


    Mês atrás

    Biosex ... I was wondering what the correct term for that is. Thanks so much!

  52. Dragon Landlord

    Dragon Landlord

    Mês atrás

    my epilepsy medication makes me shed, but i've got an thick head of hair so it's just a mild annoyance.

  53. Falbert Forester

    Falbert Forester

    Mês atrás

    I disagree with the notes towards the end of, "It's impossible to diagnose conditions from your hair" - as I can recall reading about several cases where it's been proved that someone was poisoned with arsenic - provided by testing their hair.

    • gingergamergirl98


      27 dias atrás

      Falbert Forester Yeah, with the correct equipment. Pretty sure he meant based on looks alone

  54. David Ledesma

    David Ledesma

    Mês atrás

    Anyone gets sleepy when watching these videos?

  55. crissyisajojofan


    Mês atrás

    You let a Chinese man doo doo in your mouth

  56. The Wallaby Edits

    The Wallaby Edits

    Mês atrás

    Switching to a scrunchy helped from pulling my hair out

  57. Dastreus


    Mês atrás

    I just have a couple shampoos for dandruff. THIS EPISODE MADE ME ITCHY

  58. lexitaffy1


    Mês atrás

    hi my server was raided on discord if you have it can you please join the raider banned everyone and i worked hard to gain alot of members so that upseted me i had 500+ members and 400+ were banned please join and share this with your friends and invite them :( i just wanted to be nice and i try to trust people but i always get screwed over so i invited their bot discord.gg/UHkRkqG please like this comment for it to be seen please

  59. Taylor Craig Newbold

    Taylor Craig Newbold

    Mês atrás

    Male pattern baldness is a symptom of a weak moral constitution.

  60. Are Gup

    Are Gup

    Mês atrás

    Am sorry but u really need to add other medical conditions and to go to ur dr for more deep eval.. Like a lot of dandruff for a person that never had it might be HIV sorry meant to say medical emergency symptoms.. or stop using others ppl brushes.. Ringworms causes bald patch on head.. ur body has a self warning signal to u to say hey go to the dr or something is wrong here do something before us to late. Just a little more in depth would b nice alway end with see a professional.. like excessive hiccups 4 days might also b a signal for the autoimmune disease hiv saying hey have this check out by a dr.. someone with halitosis should not blow food for a baby.. or kiss u u will get that bacteria .. meds can also do damage to the human system

  61. Eric Cartman

    Eric Cartman

    Mês atrás

    #40 on trending

  62. Rose L.

    Rose L.

    Mês atrás

    How about I just have someone give me a Amber Rose haircut and in no time it will grown evenly? What do you think?

  63. Bruce Ramirez

    Bruce Ramirez

    Mês atrás

    Jojo siwa where u at

  64. Danielle D

    Danielle D

    Mês atrás

    I had adult cradle cap!!! It was so weird. I think it could've been partially because I'm a model, and people are always putting weird products in my hair that I have no control over. I also traveled a lot and lots of different phs in the water etc, i suppose could contribute to the microbiome. I also just think it's important to scrub your scalp a bit with your nails, I read somewhere that this causes irritation so I stopped scrubbing my scalp with my nails, just my fingertips, and the buildup became more severe. Sometimes you gotta just dig in there!! Hah.

  65. Deyvid's Channel

    Deyvid's Channel

    Mês atrás

    I'm dying

  66. Madi Kuhn

    Madi Kuhn

    Mês atrás

    Jojo siwa should watch this video

  67. Katie Kane

    Katie Kane

    Mês atrás

    Why do I get a "hair headache" when I ask it to go a different way? Really annoying btw

  68. Emelia Smith

    Emelia Smith

    Mês atrás

    When I was in my teens I had a brief interesting period where two or three small patches of hair on my body just lost all pigmentation; My doctor couldn't work out why but put it down to some sort of stress reaction 🤷🏻‍♀️ (The pigmentation never return to those patches either)

  69. Elizabeth Meier

    Elizabeth Meier

    Mês atrás

    😲 I'm nearly positive the first one you talked about is what is wrong with my scalp. It's been an issue for years. I just thought I had really bad dandruff 🤷

    • Molly Stringer

      Molly Stringer

      16 dias atrás

      I'm positive that's what happened with my scalp too. One day it just stopped though? Idk, but there were like patches where it was really bad and I couldn't even push my hair over to the other side without feeling it.

  70. Demon Sword

    Demon Sword

    Mês atrás

    those Damn T-saibous

  71. Rania Toubia

    Rania Toubia

    Mês atrás

    What's a biosex female? Is it different from a woman ?

  72. Wanda Richardson

    Wanda Richardson

    Mês atrás

    So, we are all mutants👌

  73. vamsi krishna sadhu

    vamsi krishna sadhu

    Mês atrás

    Can you please make a video on ITP Idiopathic Thrombocytopenia Purpura. It is a rare auto immune disorder and there is no much information about it. Thanks.

  74. Zee Hut

    Zee Hut

    Mês atrás

    Where is Jojo Siwa!?

  75. Greg West

    Greg West

    Mês atrás

    Back hair is not weird. I agree it looks awful, but there is a strong correlation between High functioning creative cognition and hirsuteness. www.independent.co.uk/news/the-hirsute-of-higher-intelligence-1328285.html

  76. Linda Ciccoli

    Linda Ciccoli

    Mês atrás

    When I went through menopause, my thick hair thinned out a great deal.

  77. GiggitySam Entz

    GiggitySam Entz

    Mês atrás

    I'm loving the gender tolerance in your videos ♥

  78. GiggitySam Entz

    GiggitySam Entz

    Mês atrás

    Thanks for such a well-researched and well-explained video!

  79. Ghormi Bear

    Ghormi Bear

    Mês atrás

    I have PCOS and if i didn’t shave everyday I would have a beard it sucks and makes you feel less of a woman 😞

  80. lillypod21


    Mês atrás

    I learned a crapton about telogen effluvium after I started losing clumps of hair a few weeks after recovering from dengue fever. I know it's just hair and that it grows back, but suddenly losing that much hair so quickly is really distressing. It's been two years since the rapid hairloss stopped, but I feel like my hair has not gone back to how thick it was before TE.

  81. Thekrabbman


    Mês atrás

    If my scalp hurts a little after wearing a manbun (usually just after long periods of time), should I stop with the manbun or just use a "Lighter" bun?

  82. Dávid Kertész

    Dávid Kertész

    Mês atrás

    biosex females



    Mês atrás

    Hey SCI. SHOW can you tell me what the heck is QUANTUM BIOLOGY?

  84. Newtone


    Mês atrás

    Idumbbbz need to do an episode here

  85. Florin Curteanu

    Florin Curteanu

    Mês atrás

    How to get a thick healthy hair: - Eat healthy (for a light blood); - Hidratare enough (2 litres of water per day); - Don't stress or get upset (because the stress hormones attack the hair follicles); - Go outside and get some vitamin D (but don't stay to much in the sun), or take vitamin D medicals if you are a vampire; - Wash it 1-2 times a week, especially if work in dusty places (no more often); - Don't excess with the comb or with special sprays/gels (try to let the hair free, natural, to breathe); - Be happy and laugh often.

  86. TheFourthWinchester


    Mês atrás

    I do not have the body of The Rock. I cannot afford to go bald :( I recently lost a lot of hair due to Typhoid :/

  87. Pink Bunny

    Pink Bunny

    Mês atrás

    I would love to have a looser hairstyle but its so frizzy that it has to be in a bun.... Well, gotta deal with a few hair falling out.

  88. Joshua D

    Joshua D

    Mês atrás

    Remember, according to every advertisement featuring it, having visible dandruff means you will never get laid. The woman will see the flakes, have a disgusted expression, and walk away. Every time.

  89. Joy Bradford

    Joy Bradford

    Mês atrás

    No more tight ponytails for me. No wonder my hair brush is so full of hair when I am done brushing it! Thank you for your great videos!

  90. chickenfoot87


    Mês atrás

    I also have PCOS and it makes me grow a lot of body hair. I also have a deeper voice than is usual for a girl.

  91. Glider5858


    Mês atrás

    If only I had hair loss around my anus...

  92. chickenfoot87


    Mês atrás

    A fever changing the hair can happen in animals too. It's called a fever coat and can cause kittens and puppies to have a weird fluffy coat after an illness.

  93. victorpapaavp


    Mês atrás

    I have exactly 0 non black hairs on top of my head, but there's dozens of blonde and red hairs in my beard. Any idea why? Am I a closet ginger?

    • gingergamergirl98


      27 dias atrás

      victorpapaavp When my grandpa grew a beard, it had a reddish tinge to it. I suspect it’s something to do with carrying the allele, but not expressing it. Maybe beard hair is influenced by both alleles? Idk but it’s definitely, like, a thing that happens (facial hair being a different color to scalp hair)

  94. Rachel Losacco

    Rachel Losacco

    Mês atrás

    In high school I got mono and was bed ridden for 3 weeks. About a month later, I was pulling my hair out by the handfuls (though I didn't look bald, thankfully). I think it might have been telogen effluvium -- over the next few months the missing hair was growing back and I had an awkward "halo" of new hair on top of my regular long hair. But is it common that it should kick in so much later after my illness?



      Mês atrás

      It is not problem.hair has external functions for body ,not internal.not worry about it either u have gray , brown , black hairs.i will recommend don't scratch or pull out gray hair if u have.DONT TAKE STRESS IS IMPORTANT AND BE HAPPY

  95. Zman Jace

    Zman Jace

    Mês atrás

    Well I'm not even 2 mins in and my head itches. Great.

  96. SailorKeeks9997


    Mês atrás

    Thanks for covering this topic! I have hypothyroidism and many people with hypo lose their hair in clumps and get a lot of thinning especially in our eyebrows.

  97. M. Adil

    M. Adil

    Mês atrás

    Stop moving so much, Hank!

  98. Rien


    Mês atrás

    i should really get a haircut

  99. Le nurple

    Le nurple

    Mês atrás

    i have s dermatitis and t's very embarrassing for me since it's a large red spot on the back of my head

  100. Arthur O'Brien

    Arthur O'Brien

    Mês atrás

    I'm triggered by excess yeast, too.

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