O que causa a queda de cabelo?

7 minutos para ler

Afinal, o que causa a queda de cabelo? Esse é um problema fácil de resolver? Como diagnosticá-lo? Como acabar de vez com esse mal que atinge muitas pessoas, minando sua autoestima?

A verdade é que são inúmeras as causas desse problema, que gera muitas dúvidas e preocupações. Por isso, é necessário promover uma investigação mais detalhada dos hábitos que podem causá-lo para chegar a uma resposta correta.

O diagnóstico da causa da queda de cabelo não é muito simples, pode ser feito rapidamente em um consultório dermatológico, mas exige experiência do médico. Alguns fatores são mais comuns e estão relacionados a hábitos pouco saudáveis. Quando detectados, devem ser modificados para  tratar e prevenir esse problema.

Quer saber mais sobre as causas da queda de cabelo e seus diagnósticos? Continue a leitura!

Principais causas da queda de cabelo em homens e mulheres

Alopecia androgenética

Nos homens, a causa da queda de cabelo pode ser ocasionada por diversos fatores, sendo a principal a alopecia androgenética — também conhecida como calvície — motivada pela ação da testosterona que atrofia o folículo capilar.

Os primeiros sinais dessa doença podem surgir no início da idade adulta, principalmente se existem antecedentes familiares.

A maior parte da queda se concentra no topo da cabeça, nas laterais da testa e, em alguns casos, sobra cabelo apenas na nuca e na zona lateral.

Também existe a alopecia areata, provocada por uma reação autoimune ou predisposição genética, que é motivada pelo estresse, por exemplo, e que se caracteriza pelo aparecimento de falhas em um ou vários pontos da cabeça.

A alopecia androgenética também é a principal causa de queda de cabelos nas mulheres. Se inicia durante a menacme, raramente na infância, e piora após o climatério.

Em um ciclo de vida normal, o fio de cabelo cresce por 2 a 8 anos, para de crescer por alguns meses e, em seguida, cai e fica em repouso por algumas semanas — sendo substituído por um fio novo e saudável.

Na alopecia androgenética, os fios têm a fase de crescimento mais curta, e a fase de repouso, mais longa. Eles não conseguem alcançar a fase adulta, desencadeando um processo de afinamento contínuo até o seu desaparecimento.

Por isso, no caso das mulheres, a perda de cabelo é mais extensa, e não afeta apenas algumas áreas, como nos homens — mas todo o couro cabeludo.

Essa é uma disfunção genética e ocorre devido a uma sensibilidade aumentada do fio a um hormônio chamado dihidrotestosterona, que existe tanto nos homens quanto nas mulheres. Mas existem outros fatores que influenciam a fisiopatologia.

No caso da alopecia areata, as causas e manifestações clínicas são idênticas às masculinas, envolvendo o aparecimento de pequenas falhas por todo o couro cabeludo.

Má alimentação

Todos sabem que a má alimentação traz inúmeros malefícios à saúde, seja para os homens, seja para as mulheres — um organismo carente de nutrientes não realiza suas funções corretamente, tornando-se uma causa da queda de cabelo.

Sem contar que uma dieta pobre em proteínas e outros nutrientes pode levar ao desenvolvimento de anemia e de outras doenças que, por sua vez, também agravam a queda capilar.

Nessa categoria, também entram dietas da moda ou extremamente restritivas, que podem até levar à perda de peso, mas trazem prejuízos enormes ao organismo e à saúde em geral.

Causas exclusivamente femininas

Alterações hormonais

Muitas alterações hormonais, nas mulheres, podem provocar a queda de cabelo, e, entre elas, destacam-se os problemas da tireoide: o hipotireoidismo e o hipertireoidismo.

Além disso, a alteração dos hormônios sexuais tem grande influência no ciclo dos cabelos. A falta dos hormônios femininos ou o excesso dos hormônios masculinos contribuem fortemente para a queda. 

Dessa maneira, os métodos anticoncepcionais que envolvem o uso de hormônios femininos com atividade anti-androgênica ajudam na manutenção dos fios, e o uso de hormônios masculinos (testosterona e derivados), por objetivos estéticos ou na menopausa, precipita a queda.

Período pós-parto

Durante a gestação, o organismo da mulher produz uma imensa demanda de nutrientes. Após o nascimento do bebê, essa demanda continua e é intensificada pela amamentação.

O organismo materno concentra seus esforços para nutrir o recém-nascido por meio da nutrição da própria mãe. Além disso, durante o parto, ocorre muita perda de sangue e de ferro, o que influencia diretamente na queda dos fios.

Causas comuns da queda de cabelo

Veja, abaixo, algumas causas comuns da queda de cabelo:

  • anemia;
  • cirurgias;
  • excesso de oleosidade na raiz do cabelo;
  • dietas restritivas
  • tração excessiva dos cabelos 
  • doenças na pele, como lúpus;
  • medicamentos para problemas cardíacos e antibióticos;
  • quimioterapia;
  • estresse físico ou emocional;
  • tricotilomania (doença que faz o indivíduo arrancar os fios de cabelo com as mãos descontroladamente).

Diagnósticos

É mais fácil estabilizar a queda de cabelo ou retardar a sua progressão do que recuperar tudo o que já foi perdido. Por isso, o diagnóstico dessas causas é tão importante. Infelizmente, depois de um tempo de evolução, a queda de cabelo pode ser definitiva.

O exame de sangue é uma técnica fundamental de diagnóstico das causas principais ou secundárias. Nele, geralmente, são feitas algumas dosagens hormonais (de hormônios da tireoide, da hipófise, dos ovários ou dos testículos) e de algumas substâncias, como ferro, cobre, zinco e vitaminas, que se encontram em um nível muito baixo, na maioria das vezes.

Um exame essencial no diagnóstico é a Tricoscopia: um método simples e não invasivo, realizado no próprio consultório, e que tem a capacidade de diagnosticar precocemente distúrbios comuns do couro cabeludo e dos cabelos — principalmente no caso da alopecia androgenética —, proporcionando um tratamento mais eficaz. É parte do exame físico na consulta dermatológica e exige treinamento médico específico.

A imagem do couro cabeludo e das hastes é aumentada de 20 a 70 vezes, permitindo o seu estudo microscópico e uma análise comparativa — apontando os locais de comprometimento capilar —, e também avalia a resposta aos tratamentos que já vinham sendo executados.

Vimos que a causa da queda de cabelo pode variar, por isso, é muito importante não se automedicar. Se o medicamento utilizado não for adequado ao seu problema, a queda de cabelo poderá ser definitiva.

Felizmente, a maioria das quedas de cabelo param espontaneamente, o que leva a concluir que determinada vitamina ou dermocosmético foi o responsável pelo sucesso.

Por isso, somente um dermatologista capilar pode diagnosticar as causas e receitar os medicamentos e tratamentos mais indicados para o seu caso — que pode ser comum, ou, até mesmo, uma doença mais grave.

Você gostou de saber sobre a causa da queda de cabelo ou está passando por esse problema? Então continue a visita ao nosso blog e saiba mais sobre alguns tipos de tratamento para isso! Vamos lá!

Posts relacionados

251 thoughts on “O que causa a queda de cabelo?

  1. There are some fascinating deadlines in this article however I don抰 know if I see all of them middle to heart. There is some validity however I will take maintain opinion till I look into it further. Good article , thanks and we want more! Added to FeedBurner as nicely

  2. Nice post. I study something more difficult on completely different blogs everyday. It should at all times be stimulating to learn content material from other writers and practice slightly one thing from their store. I抎 favor to use some with the content on my weblog whether you don抰 mind. Natually I抣l offer you a hyperlink on your internet blog. Thanks for sharing.

  3. Nice post. I learn something new and challenging on blogs I stumbleupon everyday.
    It will always be interesting to read through articles from other authors
    and practice a little something from other web sites.

  4. I simply wished to thank you very much all over again. I’m not certain the things I would have done in the absence of the actual pointers discussed by you over this field. Entirely was the intimidating concern for me, however , seeing a new expert way you managed that forced me to leap for delight. Now i am grateful for the guidance and thus expect you know what a powerful job you are always accomplishing teaching men and women with the aid of your web blog. More than likely you’ve never encountered all of us.

  5. I precisely wished to thank you very much all over again. I do not know the things I might have taken care of in the absence of the actual suggestions provided by you relating to such question. Completely was a real daunting concern in my view, however , considering this well-written way you treated the issue forced me to leap with joy. I am just happier for your guidance and hope that you are aware of an amazing job you were doing training some other people via your web page. Probably you’ve never met all of us.

  6. Everyone loves what you guys are up too. This type of clever work and coverage! Keep up the great works guys I’ve you guys to blogroll.|

  7. Independance Immobilière – Agence Dakar Sénégal
    Av. Fadiga, Immeuble Lahad Mbacké
    BP 2975 Dakar
    +221 33 823 39 30

    Agence Immobilière Dakar

    We stumbled over here coming from a different page and thought I might check things out.
    I like what I see so i am just following you.
    Look forward to looking into your web page repeatedly.

  8. Taxi moto line
    128 Rue la Boétie
    75008 Paris
    +33 6 51 612 712  

    Taxi moto paris

    This is my first time pay a visit at here and i am genuinely impressed to read all
    at single place.

  9. M.E.C Mon Electricien Catalan
    44 Rue Henry de Turenne
    66100 Perpignan
    0651212596

    Electricien Perpignan

    Appreciating the dedication you put into your site and
    detailed information you offer. It’s awesome to come across a
    blog every once in a while that isn’t the same
    out of date rehashed material. Great read! I’ve bookmarked your
    site and I’m including your RSS feeds to my Google account.

  10. you’re really a good webmaster. The site loading pace is incredible. It seems that you are doing any distinctive trick. In addition, The contents are masterpiece. you have performed a great process on this subject!|

  11. Hi, yeah this article is really good and I have learned lot of things from it on the topic of blogging. thanks.|

  12. You have made some really good points there. I checked on the web to find out more about the issue and found most individuals will go along with your views on this web site.|

  13. May I simply just say what a comfort to discover an individual who really understands what they are talking about online. You certainly understand how to bring an issue to light and make it important. More people should read this and understand this side of the story. I can’t believe you are not more popular since you definitely possess the gift.|

  14. Hey there, I think your site might be having browser compatibility issues. When I look at your website in Ie, it looks fine but when opening in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up! Other then that, fantastic blog!|

  15. Now I am ready to do my breakfast, afterward having my breakfast coming over again to read further news.|

  16. Good web site you have here.. It’s hard to find excellent writing like yours nowadays. I honestly appreciate people like you! Take care!!|

  17. I have been exploring for a little for any high-quality articles or blog posts in this sort of area . Exploring in Yahoo I at last stumbled upon this site. Reading this info So i am glad to exhibit that I have an incredibly just right uncanny feeling I discovered exactly what I needed. I most certainly will make certain to do not forget this website and give it a look on a constant basis.|

  18. Amazing issues here. I’m very happy to look your article. Thanks a lot and I’m taking a look forward to touch you. Will you kindly drop me a e-mail?|

  19. First off I would like to say wonderful blog! I had a quick question that I’d like to ask if you do not mind. I was interested to find out how you center yourself and clear your head prior to writing. I’ve had a tough time clearing my mind in getting my thoughts out there. I do take pleasure in writing however it just seems like the first 10 to 15 minutes are usually lost just trying to figure out how to begin. Any suggestions or tips? Cheers!|

  20. I do not even know how I ended up here, but I thought this post was good. I don’t know who you are but certainly you are going to a famous blogger if you aren’t already 😉 Cheers!|

  21. Everything is very open and very clear explanation of issues. was truly information. Your website is very useful. Thanks for sharing.

  22. I like the valuable information you supply to your articles.
    I will bookmark your blog and check again right here regularly.
    I’m moderately sure I will learn lots of new stuff proper
    right here! Best of luck for the following!

  23. Hey there, I think your website might be having browser compatibility issues. When I look at your blog site in Opera, it looks fine but when opening in Internet Explorer, it has some overlapping. I just wanted to give you a quick heads up! Other then that, excellent blog!

  24. Sweet blog! I found it while searching on Yahoo News. Do
    you have any tips on how to get listed in Yahoo News?
    I’ve been trying for a while but I never
    seem to get there! Thanks

  25. Good post however I was wanting to know if you could write a litte more on this subject?
    I’d be very thankful if you could elaborate a little bit more.
    Kudos!

  26. I’m gone to tell my little brother, that he should also
    pay a quick visit this web site on regular basis to obtain updated
    from latest gossip.

  27. I enjoy what you guys are up too. This sort of clever work and exposure!
    Keep up the great works guys I’ve incorporated you guys to
    blogroll.

  28. I know this if off topic but I’m looking into starting my own blog and was
    curious what all is required to get setup? I’m
    assuming having a blog like yours would cost a pretty penny?

    I’m not very web savvy so I’m not 100% positive. Any suggestions or
    advice would be greatly appreciated. Many thanks

  29. Have you ever heard of second life (sl for short). It is basically a game where you can do anything you want. sl is literally my second life (pun intended lol). If you would like to see more you can see these sl authors and blogs

  30. Hi there just wanted to give you a brief heads up and let you know a few of the pictures aren’t loading properly. I’m not sure why but I think its a linking issue. I’ve tried it in two different web browsers and both show the same results.

  31. Have you ever heard of second life (sl for short). It is basically a online game where you can do anything you want. sl is literally my second life (pun intended lol). If you want to see more you can see these second life websites and blogs

  32. Have you ever heard of second life (sl for short). It is essentially a game where you can do anything you want. SL is literally my second life (pun intended lol). If you would like to see more you can see these second life websites and blogs

  33. Hi there would you mind sharing which blog platform you’re working with?

    I’m looking to start my own blog soon but I’m having a hard time choosing between BlogEngine/Wordpress/B2evolution and
    Drupal. The reason I ask is because your design seems different then most blogs and I’m looking for something unique.
    P.S Sorry for being off-topic but I had to ask!

  34. Have you ever heard of second life (sl for short). It is essentially a online game where you can do anything you want. sl is literally my second life (pun intended lol). If you would like to see more you can see these Second Life articles and blogs

  35. Have you ever heard of second life (sl for short). It is basically a game where you can do anything you want. Second life is literally my second life (pun intended lol). If you want to see more you can see these sl websites and blogs

  36. Have you ever heard of second life (sl for short). It is basically a online game where you can do anything you want. Second life is literally my second life (pun intended lol). If you would like to see more you can see these sl authors and blogs

  37. Have you ever heard of second life (sl for short). It is basically a game where you can do anything you want. sl is literally my second life (pun intended lol). If you want to see more you can see these Second Life authors and blogs

  38. Have you ever heard of second life (sl for short). It is basically a online game where you can do anything you want. Second life is literally my second life (pun intended lol). If you would like to see more you can see these second life articles and blogs

  39. Have you ever heard of second life (sl for short). It is basically a online game where you can do anything you want. sl is literally my second life (pun intended lol). If you want to see more you can see these sl websites and blogs

  40. The following time I learn a blog, I hope that it doesnt disappoint me as a lot as this one. I imply, I know it was my option to read, however I actually thought youd have one thing interesting to say. All I hear is a bunch of whining about something that you can fix should you werent too busy searching for attention.

  41. As I web site possessor I believe the content matter here is rattling wonderful , appreciate it for your efforts. You should keep it up forever! Best of luck.

  42. Undeniably believe that which you said. Your favorite reason appeared to be on the web the easiest thing to be aware of. I say to you, I certainly get annoyed while people think about worries that they plainly don’t know about. You managed to hit the nail upon the top as well as defined out the whole thing without having side effect , people can take a signal. Will probably be back to get more. Thanks

  43. I like what you guys are up too. Such intelligent work and reporting! Carry on the superb works guys I have incorporated you guys to my blogroll. I think it’ll improve the value of my site 🙂

Deixe uma resposta

Share This