Hair is mostly made out of keratin (the same stuff as fingernails and reptile scales). Hair "stubbles" left over from shaving are prickly.

Intuitively, growing hair should hurt. Dozens of keratin cactus-needles forcing their way out.

Does the hair somehow manage to avoid all the pain nerves?

  • $\begingroup$ Stubble is already above the skin, i.e. beyond the reach of the nerves. It is no different from growing nails. Why shouldn't that hurt? Bone... That should hurt; it's very hard. But, you'd be right about teeth. They do hurt coming out. Good thing they do it slowly. $\endgroup$ – anongoodnurse Sep 15 '17 at 15:40
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    $\begingroup$ @anongoodnurse: It's also possible to have ingrowing hairs, which can hurt, or at least cause a noticable sensation. $\endgroup$ – jamesqf Sep 16 '17 at 4:31
  • $\begingroup$ Why do you suppose it would hurt? Hair follicles are dedicated epidermal structures, which protrude in to the air. They don't impinge on any nerves so wouldn't cause pain. Ingrown hairs can become painful because the swelling does impinge on a nerve ending, as the hair is 'out of place' $\endgroup$ – Joe Healey Sep 16 '17 at 12:05
  • $\begingroup$ @jamesqf - Yes, point taken. But normally, it doesn't hurt. Abnormally, one can have ingrown hairs, bone spurs and impacted wisdom teeth, which all hurt. $\endgroup$ – anongoodnurse Sep 16 '17 at 13:55

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