When an insect bites you or an allergen touches your skin, your body releases a chemical called *histamine. This histamine sends a signal through special nerve fibers called pruriceptors to the brain, which interprets it as an itch.
In response, the brain tells you to scratch. Scratching creates a temporary pain signal that overrides the itch sensation, which is why it feels relieving even though it doesn’t fix the cause.
So basically, itching is your body’s way of detecting irritation and reacting through a built-in nerve signaling system.
