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cover of episode Why can’t we feel our hair growing?

Why can’t we feel our hair growing?

2025/3/24
logo of podcast Moment of Um

Moment of Um
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Sandon Totten
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Wendy Hunter医生：我们感觉不到头发生长，主要是因为头发本身并没有神经。头发的生长发生在毛囊内部，就像植物在花盆里生长一样，我们无法感觉到花盆里的土壤和植物的生长过程。虽然头发的生长速度非常缓慢，不足以刺激皮肤上的神经，但如果我们拉扯头发，就能感觉到疼痛，这是因为皮肤上的神经被刺激到了。 总而言之，头发本身没有神经末梢，所以我们感觉不到它在生长。而皮肤上的神经只有在受到外部刺激，例如拉扯头发时才会被激活，从而产生感觉。 Sandon Totten：从我个人的角度来说，我今天理发了，发现头发剪短了，这让我非常沮丧。我不断地照镜子，想看看头发是否长长了，但是我感觉不到它在生长。这让我很好奇，为什么我们感觉不到头发在生长？

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Shownotes Transcript

Heads up! Your hair is always growing. Like your fingernails, hair is a part of our body that will grow and grow unless you cut it. But how come we don’t feel it growing? We asked pediatrician Dr Wendy Hunter to help us find the answer.

Got a question that has you tearing your hair out? Send it to us at BrainsOn.org/contact), and we’ll help comb through research for the answer.