Why do we itch? – Emma Bryce

Why do we itch? – Emma Bryce

You’re standing at
the ready inside the goal when suddenly, you feel an intense itch
on the back of your head. We’ve all experienced the annoyance
of an inconvenient itch, but have you ever pondered why
we itch in the first place? The average person experiences
dozens of individual itches each day. They can be triggered by all sorts
of things, including allergic reactions, dryness, and even some diseases. And then there are the mysterious ones
that pop up for no reason at all, or just from talking about itching. You’re scratching your head right now,
aren’t you? Anyhow, let’s take one of the most
common sources: bug bites. When a mosquito bites you, it releases a compound into your body
called an anticoagulant that prevents your blood from clotting. That compound,
which we’re mildly allergic to, triggers the release of histamine, a chemical that makes
our capillaries swell. This enables increased blood flow, which helpfully accelerates
the body’s immune response to this perceived threat. That explains the swelling, and it’s the same reason pollen
can make your eyes puff up. Histamine also activates the nerves
involved in itching, which is why bug bites make you scratch. But the itchy sensation itself
isn’t yet fully understood. In fact, much of what we do know comes from studying
the mechanics of itching in mice. Researchers have discovered that
itch signals in their skin are transmitted via a subclass of
the nerves that are associated with pain. These dedicated nerves produce a molecule
called natriuretic polypetide B, which triggers a signal that’s carried
up the spinal cord to the brain, where it creates the feeling of an itch. When we scratch, the action of our
fingernails on the skin causes a low level pain signal
that overrides the itching sensation. It’s almost like a distraction,
which creates the sensation of relief. But is there actually an evolutionary
purpose to the itch, or is it simply there to annoy us? The leading theory is that our skin
has evolved to be acutely aware of touch so that we’re equipped to deal with risks
from the outside world. Think about it. Our automatic scratching response
would dislodge anything harmful that’s potentially lurking on our skin, like a harmful sting, a biting insect, or the tendrils of a poisonous plant. This might explain why we don’t
feel itching inside our bodies, like in our intestines, which is safe from these external threats, though imagine how
maddening that would be. In some people, glitches in the pathways
responsible for all of this can cause excessive itching
that can actually harm their health. One extreme example is a psychological
condition called delusory parasitosis where people believe their bodies
are infested with mites or fleas scurrying over and under their skin, making them itch incessantly. Another phenomenon
called phantom itching can occur in patients
who’ve had amputations. Because this injury has
so severely damaged the nervous system, it confuses the body’s normal
nerve signaling and creates sensations in limbs
that are no longer there. Doctors are now finding ways
to treat these itching anomalies. In amputees, mirrors are used to reflect
the remaining limb, which the patient scratches. That creates an illusion
that tricks the brain into thinking the imaginary
itch has been satisfied. Oddly enough, that actually works. Researchers are also searching
for the genes involved in itching and developing treatments to try
and block the pathway of an itch in extreme cases. If having an unscratchable itch
feels like your own personal hell, Dante agreed. The Italian poet wrote about
a section of hell where people were punished by being
left in pits to itch for all eternity.

NBC Nightly News Broadcast (Full) – February 20th, 2020 | NBC Nightly News

Related posts: Third Graders Shave Their Heads To Support Their Friend With Alopecia | NBC Nightly News Trump Has TotalRead More NBC Nightly News Broadcast (Full) – February 20th, 2020 | NBC Nightly News

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(eng/jpn/vtn) 💜GRWM🔮보라색 머리하고 증명사진 찍으러 가는날 같이 준비해요! + purple hair

Shake your head ~ The hair color is weird … it’s green … So … Bought this! Where is theRead More (eng/jpn/vtn) 💜GRWM🔮보라색 머리하고 증명사진 찍으러 가는날 같이 준비해요! + purple hair

100 Replies to “Why do we itch? – Emma Bryce”

  1. Have you ever had a itch that's really hard to get? Like a itch on a toe when you have a shoe on? Or in your ear? Or in your… I'm just gonna stop there. But ya, itches are aweful

  2. I have a no-see-um bite on my elbow. Those things should all burn in the underworld. ( if you don’t know what a no-see-um is- google it ;—;)

  3. Please help me cure this itch all over my body I always itch if I'm in a hot place my Mom told me that what I'm having that itch because I have asthma😞

  4. Does the inside of ur nose ever itch and then u itch it and some random kid is like oooo they’re picking their nose
    Just me? Ok

  5. Okay for some reason when I was really young, like 6 or something for only my hand, likely on my thumb it itches like, under the skin? For some reason? It was really annoying, but it didn't itch when I literally scraped it, to itch it.

  6. I have dry skin so that can itch
    I have a hair pulling disorder and when the hair grows back it can itch
    But once about 18 months ago I end with a itch for about a week it was one night the itch was so severe that the other dry skin and hair growing times seen like a one or two anyways that night the itch was at a 10 for two and at night I thought I was only imagine it like texture psychosis.

  7. I hate that punishment at the end! NEVER want it EVER!
    The demons should gravitate down at 1,000,000,000,000,000,000,000,000,000,000,000,000 mph so they can dissolve in 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001 seconds. that is 0.00000000000001 yoctoseconds. REALLY small.

  8. I dont know if it is just me but even when my hair is washed and clean I start itching it when its hot outside or anyplace iam in😭😭😭

    No just me OK.😂

  9. Wrong I was watching the side of my tummy next time to scientific research that might give you the answer and I'm not right I'm not wrong I don't know seriously bro

  10. I found this unique eczema manual “Rαsοkο Kuzo” (Gοοgle it) two winters ago when I had been encountering a really undesirable eczema outbreak in the hands and wrists. My own fingers were red, itchy, dry. The manual is magic that truly works. I was not out of the trouble of wrapping my very own palms, thanks a lot to this manual. You ought to use this. .

  11. So, i'm highly allergic to pollen everytime its pollen season my eyes get really irritated and itchy and so does my skin. ;-;

  12. Lovely video content! Apologies for chiming in, I would love your initial thoughts. Have you researched – Honenry Hiycarlett Principle (Sure I saw it on Google)? It is a great exclusive product for stopping eczema without the hard work. Ive heard some unbelievable things about it and my close friend Aubrey after a lifetime of fighting got astronomical results with it.

  13. Great video content! Apologies for chiming in, I am interested in your thoughts. Have you heard about – Honenry Hiycarlett Principle (erm, check it on google should be there)? It is a good one of a kind guide for stopping eczema minus the hard work. Ive heard some great things about it and my friend Sam at last got amazing success with it.

  14. I use these back scratcher set to solve my back itch issue which can buy on Amazon


  15. I'm itchy.
    I don't have plants near by me. Maybe some small bugs that i cant see, or my head is extremely dry but whatever is the reason I'm scratching along… It's annoying that i know it's immiginary and it wil go as i distract myself!! 😒
    Thanks for explaining

  16. Ever wear jeans or pants and get this uncontrollable itch in your legs that just never goes away no matter how much you scratch? Hate those

  17. I have eczema. It is horrible. I cant stop scratching until the itch is gone, normally when it starts to bleed. I hate it.

  18. Well I’ve got two theories on a recent issue . One is my jeans were to long and went under my heels in a standing position on the street coming in contact with some part of street grime infected with some bacterial growth that made its way onto my lower leg . The second theory and most probable is my last roommate. Was in kidney dialysis at a major hospital. Now it’s common knowledge that hospitals carry the most resistant bacteria’s known to man . So it’s very possible and probable with his regular attendance to this place he picked up some exotic durable biological parasite and brought it back to our room . Either way I’m not happy about it . I now bleach my skin and use excessive cleaning measures . Careful where you spend time you’ll might not exit the way you entered .

  19. The true reason we itch, is due to inner heat which needs to get out. The scratching opens up the skin tissues and allows heat to cool down.
    That is why hot water increases itching, because the heat increases. Hope that helps.
    Weird that science haven't figured it out…

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