5 Things Your Hair Can Tell You About Your Health

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  • Published on Mar 24, 2019
  • 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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    Sources:
    Dandruff:
    www.ncbi.nlm.nih.gov/pmc/articles/PMC2923939/
    nationaleczema.org/eczema/types-of-eczema/seborrheic-dermatitis/
    www.ncbi.nlm.nih.gov/pmc/articles/PMC2923939/
    www.aad.org/public/diseases/scaly-skin/seborrheic-dermatitis#overview
    General hair loss:
    discovermagazine.com/2002/feb/featbiology
    jcs.biologists.org/content/119/3/391
    onlinelibrary.wiley.com/doi/abs/10.1111/j.1365-4632.2005.02800.x
    uihc.org/health-topics/traction-alopecia-type-hair-loss
    www.aocd.org/page/telogeneffluviumha
    www.health.harvard.edu/a_to_z/telogen-effluvium-a-to-z
    www.ncbi.nlm.nih.gov/pmc/articles/PMC4606321/
    link.springer.com/chapter/10.1007/978-3-540-46911-7_13
    ghr.nlm.nih.gov/condition/androgenetic-alopecia
    Patchy hair loss:
    www.ncbi.nlm.nih.gov/pmc/articles/PMC3537782/
    www.aad.org/public/diseases/hair-and-scalp-problems/alopecia-areata
    www.mdedge.com/dermatology/article/67306/hair-nails/alopecia-association-sexually-transmitted-disease-review
    www.jaad.org/article/S0190-9622(09)00518-0/fulltext
    rarediseases.org/rare-diseases/alopecia-areata/
    www.ncbi.nlm.nih.gov/pubmed/26077574
    Unusual hair growth:
    rarediseases.info.nih.gov/diseases/2864/hypertrichosis-lanuginosa-acquired
    thejns.org/view/journals/j-neurosurg/129/1/article-p48.xml
    journals.sagepub.com/doi/abs/10.1177/1203475415582319
    www.ncbi.nlm.nih.gov/pmc/articles/PMC2836432/
    Thicker hair growth:
    www.mayoclinic.org/diseases-conditions/hirsutism/symptoms-causes/syc-20354935
    link.springer.com/chapter/10.1007%2F978-3-319-14863-2_17
    www.ncbi.nlm.nih.gov/pmc/articles/PMC2856356/
    obgyn.ucla.edu/hirsutism




    en.wikipedia.org/wiki/Hypertrichosis

Comments • 707

  • MsMcmoe
    MsMcmoe 15 days ago

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

  • Ginny Kudish
    Ginny Kudish 16 days ago

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

  • limpnjen
    limpnjen 19 days ago

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

  • Mr Niceguy
    Mr Niceguy 20 days ago

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

  • Maurice Spence
    Maurice Spence 20 days ago

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

  • Rachel Holt
    Rachel Holt 21 day ago

    Shedding more frequently can also be caused by thyroid imbalances

  • Morris Chen
    Morris Chen 22 days ago +5

    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)

  • Mathew Subritzky
    Mathew Subritzky 25 days ago

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

  • Lucia Jayne
    Lucia Jayne 25 days ago

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

  • Michael P.
    Michael P. 25 days ago

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

  • Letolz Velostoll
    Letolz Velostoll 26 days ago +2

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

  • Nightshade Kelly
    Nightshade Kelly 26 days ago +1

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

  • Nightshade Kelly
    Nightshade Kelly 26 days ago

    Im 16 and have gray hair

  • Nightshade Kelly
    Nightshade Kelly 26 days ago +1

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

  • Professsor
    Professsor 26 days ago

    My scalp is itchy...

  • Elly Arrow
    Elly Arrow 27 days ago

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

  • -
    - 27 days ago +1

    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.

  • chad x
    chad x 28 days ago

    Right. So leave it to your incompetent doctor.

  • Hypatia Ravenclaw Sklodowska

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

  • Rug46
    Rug46 28 days ago

    Where are my fellow red hair bois :P

  • Luka Cvitkovic
    Luka Cvitkovic 28 days ago

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

  • DaBlondDude
    DaBlondDude 28 days ago

    Nice disclaimer lol, though kinda sad it's needed

  • Nishant Sengar
    Nishant Sengar 29 days ago

    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 days ago

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

    • gingergamergirl98
      gingergamergirl98 26 days ago

      Nishant Sengar AFAIK it’s genetic

  • Jeremy Pickett
    Jeremy Pickett 29 days ago +1

    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.

  • Paul Sutherland
    Paul Sutherland 29 days ago

    He said "give you a heads up."😛🤤

  • blub232324
    blub232324 29 days ago

    2:20 looks almost like Matt Parker :)

  • edi
    edi 29 days ago

    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)?

  • Nikki Williamson
    Nikki Williamson 29 days ago

    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...

  • Peldyn - Life with Cats

    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.

  • IncontrovertibleTruth
    IncontrovertibleTruth 29 days ago

    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

  • TheSzyko
    TheSzyko 29 days ago

    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!

  • X3DN
    X3DN 29 days ago

    My hair is bleached and colored

  • Gibraltar
    Gibraltar 29 days ago

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

  • Ibolya Szijgyarto
    Ibolya Szijgyarto Month ago

    Traction alopecia *cough*Jojo Siwa*cough*

  • veksu9
    veksu9 Month ago

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

  • Jamail44
    Jamail44 Month ago

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

  • Sharon Johnston
    Sharon Johnston Month ago

    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.

  • That Sagittarius Girl

    And here I am with my trichotillimaniac hands

  • pyukumuku 95
    pyukumuku 95 Month ago

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

  • David Oh
    David Oh Month ago

    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?

  • Chapter Eleven
    Chapter Eleven Month ago +3

    me, with an oily scalp and dandruff: sigh

  • Feral Crafter
    Feral Crafter Month ago

    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?

  • Ico
    Ico Month ago

    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?

  • Rachel Swanson
    Rachel Swanson Month ago

    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.

  • John Smith
    John Smith Month ago

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

    • zacharymli
      zacharymli Month ago

      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.

  • TheMeganano
    TheMeganano Month ago

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

  • Lucky
    Lucky Month ago

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

    • zacharymli
      zacharymli Month ago

      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.

  • paul mryglod
    paul mryglod Month ago

    Mine is abandoning my head. What does it know?

  • BeUnotATVrobot
    BeUnotATVrobot Month ago

    Actually 6, that also you are a brainwashed TV Robot

  • Michael Seydor
    Michael Seydor Month ago

    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!

  • 69ouroboros69
    69ouroboros69 Month ago

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

  • Dragon Landlord
    Dragon Landlord Month ago

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

  • Falbert Forester
    Falbert Forester Month ago

    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
      gingergamergirl98 26 days ago

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

  • David Ledesma
    David Ledesma Month ago +1

    Anyone gets sleepy when watching these videos?

  • crissyisajojofan
    crissyisajojofan Month ago

    You let a Chinese man doo doo in your mouth

  • The Wallaby Edits
    The Wallaby Edits Month ago

    Switching to a scrunchy helped from pulling my hair out

  • Dastreus
    Dastreus Month ago +1

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

  • lexitaffy1
    lexitaffy1 Month ago +1

    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

  • Taylor Craig Newbold

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

  • Are Gup
    Are Gup Month ago

    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

  • Eric Cartman
    Eric Cartman Month ago

    #40 on trending

  • Rose L.
    Rose L. Month ago

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

  • Bruce Ramirez
    Bruce Ramirez Month ago

    Jojo siwa where u at

  • Danielle D
    Danielle D Month ago

    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.

  • Deyvid's Channel
    Deyvid's Channel Month ago

    I'm dying

  • Madi Kuhn
    Madi Kuhn Month ago

    Jojo siwa should watch this video

  • Katie Kane
    Katie Kane Month ago

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

  • Emelia Smith
    Emelia Smith Month ago

    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)

  • Elizabeth Meier
    Elizabeth Meier Month ago

    😲 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 15 days ago

      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.

  • Demon Sword
    Demon Sword Month ago

    those Damn T-saibous

  • Rania Toubia
    Rania Toubia Month ago

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

  • Wanda Richardson
    Wanda Richardson Month ago

    So, we are all mutants👌

  • vamsi krishna sadhu

    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.

  • Zee Hut
    Zee Hut Month ago

    Where is Jojo Siwa!?

  • Greg West
    Greg West Month ago

    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

  • Linda Ciccoli
    Linda Ciccoli Month ago +1

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

  • GiggitySam Entz
    GiggitySam Entz Month ago

    I'm loving the gender tolerance in your videos ♥

  • GiggitySam Entz
    GiggitySam Entz Month ago +1

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

  • Ghormi Bear
    Ghormi Bear Month ago +9

    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 😞

  • lillypod21
    lillypod21 Month ago

    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.

  • Thekrabbman
    Thekrabbman Month ago

    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?

  • Dávid Kertész
    Dávid Kertész Month ago

    biosex females

  • NILUFA YESMIN
    NILUFA YESMIN Month ago

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

  • Newtone
    Newtone Month ago

    Idumbbbz need to do an episode here

  • Florin Curteanu
    Florin Curteanu Month ago +2

    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.

  • TheFourthWinchester
    TheFourthWinchester Month ago +5

    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 :/

  • Pink Bunny
    Pink Bunny Month ago

    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.

  • Joshua D
    Joshua D Month ago

    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.

  • Joy Bradford
    Joy Bradford Month ago

    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!

  • chickenfoot87
    chickenfoot87 Month ago +4

    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.

  • Glider5858
    Glider5858 Month ago +1

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

  • chickenfoot87
    chickenfoot87 Month ago

    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.

  • victorpapaavp
    victorpapaavp Month ago

    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
      gingergamergirl98 26 days ago

      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)

  • Rachel Losacco
    Rachel Losacco Month ago

    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?

    • HOW MANY YOUTUBE CHANNEL IN THE WORLD
      HOW MANY YOUTUBE CHANNEL IN THE WORLD Month ago

      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

  • Zman Jace
    Zman Jace Month ago +1

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

  • SailorKeeks9997
    SailorKeeks9997 Month ago +1

    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.

  • M. Adil
    M. Adil Month ago

    Stop moving so much, Hank!

  • Rien
    Rien Month ago

    i should really get a haircut

  • Le nurple
    Le nurple Month ago

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

  • Arthur O'Brien
    Arthur O'Brien Month ago

    I'm triggered by excess yeast, too.