Why some nervous habits are actually complex neurological disorders

Health · Published 1 November 2026 Swipe more like this →

In short: Biting your nails or picking at your skin might feel like a simple way to pass the time, but for many, these actions are driven by intense, uncontrollable urges. Research suggests that genetics, brain structure, and emotions all play a role in these repetitive behaviors.

Body-focused repetitive behavior (BFRB) disorders involve self-grooming actions that unintentionally harm the body. While often dismissed as mere nervous habits, they are recognized by the American Psychiatric Association’s DSM-5-TR as clinical conditions. The two most common types are trichotillomania (hair pulling) and excoriation disorder (skin picking). Other behaviors include onychotillomania (nail picking), dermatophagia (skin biting), and rhinotillexomania (nose picking). These behaviors are characterized by an intense, uncontrollable urge that can provide a sense of pleasure or satisfaction upon completion. The DSM-5-TR also recognizes lip bite keratosis and morsicatio buccarum as related conditions. Furthermore, trichotillomania is distinct from the mania associated with bipolar disorder despite its name.

While many people may struggle to reduce the frequency of these actions, they often find it difficult to stop entirely. Estimates suggest that between 0.5% and 4.4% of the population meets the criteria for a clinical BFRB diagnosis, though the actual prevalence is likely much higher because many individuals do not seek professional help. These behaviors are often recognized by others as simple ways to pass time when bored. However, they involve complex interactions between brain structure and genetics.

Treatment typically focuses on behavioral interventions rather than standard medications. Habit reversal training, a form of cognitive behavior therapy, is frequently used alongside a self-help technique called decoupling. Decoupling works by having the individual perform a different action whenever they feel the tension that triggers the compulsion, effectively disrupting the neurological connection between emotion and the repetitive behavior. Other explored options include yoga, aerobic exercise, acupuncture, biofeedback, hypnosis, and supplements like inositol or N-acetylcysteine. Alternative therapies such as acupuncture and biofeedback have been explored for these conditions. Additionally, there is currently no standard medication approved specifically for treating BFRBs.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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