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Based on observations of my own body, I noticed that there are three types of itching.
The first is the itching of dry crusts over sores. In my opinion, there is an obvious incentive for the body to get rid of the dried crust.
The second is itching from dirt. It can be assumed that dirt clogs the pores on the skin, and the body needs to “shake up” this place. (perhaps the mechanism of the onset of itching here is the same as in the first case)
The third is an inexplicable desire to suddenly scratch yourself. By analogy with the first two types, I assume that this occurs from blockage of some tubules, or other malfunction of the skin. It's worth scratching, and everything passes.
Summing up, itching is a signal of the body to help a person in those cases that he cannot solve with his biological mechanisms.
Because itching is a “harbinger” of pain. These are weakened impulses from pain receptors, which, however, can appear not only before, but also after, and instead of pain. This is a kind of warning: just a little more and it will hurt.
But itching can occur not only as a reflection of real sensations, but also as a result of” glitches ” of the tense nervous system. Many people are familiar with the condition when, after an eventful day (and, especially, in the evening), when falling asleep, the head or body suddenly begins to itch. This is the result of the fact that the accumulated nervous tension “comes out”, directing unrealized impulses along the most harmless path.