Politis

Why Do We Bite Our Nails? New Theory Suggests Self-Protection

Published January 17, 2026, 09:22
Why Do We Bite Our Nails? New Theory Suggests Self-Protection

A new psychological theory suggests that behaviors like nail-biting and skin-picking aren't simply nervous habits, but survival mechanisms developed to help humans manage anxiety and gain a sense of control. Clinical psychologist Dr. Charlie Herrriot-Maitland explains that these 'small harms' provide an immediate focus and release of tension, preferable to being overwhelmed by uncontrolled emotions. This theory places these behaviors on a spectrum of self-harm, from mild to extreme, and highlights the evolutionary basis of the human brain, which is programmed for survival and avoiding unpredictable situations.