Why doesn t it hurt to prick your hair, and why does your scalp hurt if you don t tie your hair?

The hair is tough but not hard enough, which means that it bends when it ties something, so it can't exert too much force.

Secondly, there is another reason, that is, people's ** is not sensitive to such very fine things. When you prick yourself with a needle, it hurts a lot, because the force you have on the needle is actually much more than 1 N (3 4 N bar).When you tie yourself with your hair, it's good that your hair can withstand a force of 1 ox without bending, and with such a small force, it's good to feel the itch.

It is a truth that mosquitoes don't hurt when they bite.

Because the hair is long.

It is bent as soon as it is paught, and the actual stress area is relatively large.

In fact, even very short hair can also be prickly.

Like a beard.

The first half of what the landlord said was correct.

However, the last sentence is wrong.

You used a force of 1n and did not act on the stressed surface.

And the force that exceeds that causes the hair to bend.

Only a small amount of force is exerted on the stressed surface. Naturally, people don't hurt anymore.

If the landlord can guarantee that the hair does not bend.

You can prick people with hair. For example, if you get glue on it, you will find that your hair is prickly.

There will be some noticeable sensations ...

The hair is soft, and if you use too much force, the hair will bend when it touches **.

The hair is thin and soft.

That's your hair growing!

Scalp pain may also be due to the fact that after washing your hair, your hair doesn't dry and you go out to let the wind blow, and many people like to wash their hair at night, and sleeping without dry hair is also easy to cause scalp pain.

Neuralgia on both sides of the head may be a neuropathic headache, it may be caused by too much tension at study or work, don't ignore the neuropathic headache, you should go to the hospital for a check-up, take some medicine for that is very important, don't be sloppy. There are a lot of analyses that can be done: First:

A manifestation of a cold, many people are before or after a cold, there will be a phenomenon of uncomfortable scalp, very tight, etc., second: life pressure or work pressure, if you live under pressure or work too much, there will be a symptom of qi stagnation, then you will feel uncomfortable in the head, there are symptoms of pain. Third:

Bad rest. Find out why. Health first, pay attention to your body, and hope you recover your health soon.