Why Does Skin Hurt When Cut, But Hair & Nails Don't? - A Scientific Explanation

Different tissue types.

* Skin is a complex organ with multiple layers, including the epidermis, dermis, and hypodermis. When skin is cut, it damages cells, blood vessels, and nerve endings, causing pain.

* Hair and nails are not composed of living cells; instead, they are made of tough, fibrous proteins that do not contain any nerve endings. When hair or nails are cut or trimmed, they do not cause any pain.

Nerve density.

* Skin is densely innervated with nerve endings that sense pain, temperature, and other sensations. This allows us to feel pain instantly when our skin is cut or injured.

* In contrast, hair and nails only have a few nerve endings located at the base, where they are attached to the body. The absence of nerve endings in the shaft of hair and nails is why cutting them does not cause any pain.