Why do the hearts of the feet itch, and why do you have to pick the itchy feet with your hands

People have two kinds of itching sensations: one is the itching sensation like a small worm crawling gently on the **, such as ears, nostrils, palms, and feet that are extremely sensitive to this itching; The other is caused by strong scratching on a certain part of the body by the outside world, such as the armpits of the upper limbs. Some people think that this is due to itchy receptors in **.

Receptors are special nerve endings that carry information to the spinal cord and brain, and when the cranial nerves receive this itching information, they will make some reflex behavior to counteract the itch.

The parts that are afraid of itching are generally the vital parts of people, once these are in contact with foreign objects, it means a potential threat, feeling itchy is to avoid this threat, of course, their hands do not have any threat to themselves, so they will not itch, and lovers who fully trust each other will not feel itchy, so this can be used as a test whether the other party fully trusts you. Excerpt from.

Huashang Morning Post

Answer: Because we are human beings, the hands are used to pick the feet, and there are generally several kinds of feet (1lazy; 2.crippled hands; 3.It's a person who deliberately wants to pick his feet with his feet. 4.primates).

Can just picking by hand solve the problem?

A: Of course not, but in the absence of any other items or things that can be solved, picking by hand is the most direct and fastest way. Otherwise, the manufacturers that sell those things would have gone bankrupt.

Solution: 1. Pick by hand.

2. Pick with your feet (technical difficulty).

3. Analyze why it is itchy and why it is good to prescribe the right medicine (if it is a mosquito bite, you should use wind oil essence, cooling oil, flower water, etc.; If it is dermatitis, you should go to the hospital to check what kind of dermatitis you should use, and after the diagnosis is confirmed, the doctor will prescribe what kind of dermatitis ointment to use); Another is that when the wound is healing (that is, when I was a child, I often heard adults talk about the long flesh period), in this case, you must not use the picking, and gently stroke it with your fingers, so as not to add new injuries to the old wounds.

This is currently the most accepted psychological explanation for why you laugh when you are tickled

In the long history of evolution, in order to survive more tenaciously in a dangerous environment, human beings have evolved a very sensitive nervous system to carry out danger warnings, for unknown sudden physical contact, our brain will instinctively think that it is a danger signal, but tickling is a harmless contact, when we are aware, the body's alarm is lifted, a relaxed psychological state, and an instinctive response to this psychological state, that is laughter.

Therefore, scratching yourself will make you laugh, and scratching yourself will not produce the above physiological reactions.