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  • Triss can you scratch my back? Yeah right there, yeah.

    Triss你可以幫我抓抓背嗎?對,就是那裡,對

  • Down a little bit. OK. Oh, yeah, that's it. Don't stop.

    下面一點。好,對了。不要停

  • Hey guys, Tara here with an answer to one of life's greatest mysteries,

    嗨各位,我是 Tara,今天將要為大家解答一件生活中的奧秘

  • why is scratching an itch always make it worse.

    那就是為什麼我們抓癢時會越抓越癢呢

  • Every one of us has been bitten by a mosquito at some point.

    我們每個人都一定有被蚊子咬的經驗

  • It actually happened to a friend of mine last week,

    我的一個朋友就在上週被蚊子咬了

  • and he ended up scratching it so hard he created an open wound,

    他抓得太用力,最後變成了一個破皮大傷口

  • the size of a dime which is disgusting.

    像一個硬幣一樣大,非常噁心

  • But we've all been there , well some of us.

    但我們都有過這樣的經驗,有些人啦

  • Most of us get a bug bite, we scratch it for a while and then in a few days it goes way,

    我們大部分的人被蟲咬後,抓一下,然後過幾天包就會消失了

  • and we never think about it again.

    我們再也不會想起它

  • But believe it or not there are millions of people out there who suffer from chronic itching.

    不論你相不相信,世界上有幾百萬人深受慢性搔癢症所苦

  • Conditions like eczema and even cancer or kidney failure can worsen it,

    症狀像是濕疹,癌症或腎衰竭甚至會讓你癢得更嚴重

  • and in many cases it can have a serious impact on someone's life.

    在許多案例中,「癢」甚至會影響到一個人的生活

  • Well, it boils down to serotonin.

    這是因為血清素的關係

  • Serotonin is a neurotransmitter that regulates tons of different functions in your body.

    血清素是一種神經遞質,負責調節許多身體中不同的功能

  • Your mood, your memory, your sleep, your appetite, even blood clotting.

    你的情緒、記憶、睡眠、胃口,甚至是凝血功能

  • It produces feelings about happiness and well-being but it also controls pain,

    血清素也會製造快樂和幸福的感覺,但它同時也控制了痛覺

  • and that's where the itching part comes in.

    這也是「癢」的來源

  • Chu France Chen, as a researcher at Washington University,

    華盛頓大學的學者 Chu France Chen

  • and he's been conducting studies over the years to see what produces the urge to itch.

    已經研究「造成癢的原因」許多年

  • His most recent one involved mice who were genetically engineered to produce no serotonin.

    他最新的實驗對象是基因改造的老鼠,牠們體內沒有血清素

  • And he found that when those mice were injected with a chemical to induce itching,

    他發現當這些老鼠被注射引發搔癢感的化學物時

  • they had almost no urge to scratch.

    他們幾乎不會有抓癢的動作

  • Meaning that the urge to scratch an itch begins as soon as serotonin leaves your brain and reaches the irritated spot,

    這代表一旦血清素離開大腦到達患部,你就會產生抓癢的欲望

  • so whenever we scratch an itch we're actually doing so

    所以我們在抓癢時就是這麼回事

  • because the pain of scratching temporarily overrides the itchy feeling.

    因為抓癢造成的疼痛感會覆蓋過癢的感覺

  • The problem is that

    問題是

  • that pain causes your brain to release more serotonin

    這種痛覺會讓你的腦釋放更多的血清素

  • which intensifies the itch even more, So it's essentially a feedback loop.

    血清素會加劇你癢的感覺。所以這基本上是個循環

  • Where you're constantly scratching harder and harder to get rid of the itchy feeling, but all you're doing is really making it even more itchy.

    當你一直抓癢,越抓越用力,想要擺脫癢的感覺時,你在做的只是讓它越來越癢。

  • It make sense but it does bring up another interesting question.

    這也引發另一個有趣的問題

  • Why does serotonin cause an itchy sensation to begin with?

    為甚麼血清素帶來的感覺會被稱為「癢」呢?

  • Well according to Chen, it has to do with GRPR neurons

    根據 Chen 的說法,這跟一組腦細胞 GRPR 神經元有關

  • which are a group of brain cells known to increase itchy sensations.

    GRPR神經元會造成癢的感覺

  • A serotonin starts rushing to the part of your body that's irritated,

    當血清素開始衝向患部時

  • Its wires basically get crossed,

    線路被連接起來

  • and it activates those GRPR neurons which intensifies the itch even more.

    刺激 GRPR 神經元,加劇癢的感覺

  • Chen believes that people who suffer from chronic itching could find relief

    Chen 相信長期受癢所苦的人可以得到解脫

  • once a therapy is developed to block the receptor that cause the serotonin to activate those neurons.

    只要能夠發展出攔阻神經元傳遞血清素到感覺器官的治療方法

  • Until then the best solution seems to be lots of anti-itching cream and other mittens, the softer the better.

    在此之前,最好的治療方法似乎只有抗癢霜、防抓手套。

  • My suggestion not his.

    這是我的建議啦,不是 Chen 的

  • What do you guys think? Have you ever scratch the itch so hard that made you bleed?

    你們覺得呢?你有沒有因為抓癢抓到流血的經驗?

  • And how did that work out for you?

    這對你造成怎麼樣的影響呢?

  • Feel free to share your experiences with us in the comments down below.

    請在下方留言,跟我們分享你的經驗吧

  • And as always thank you guys for watching.

    照慣例,謝謝你們的收看

Triss can you scratch my back? Yeah right there, yeah.

Triss你可以幫我抓抓背嗎?對,就是那裡,對

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生活小常識!為什麼抓癢會越抓越癢呢?(Why Scratching An Itch Makes It Worse)

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    Gisele Sung 發佈於 2017 年 08 月 08 日
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