Body-Focused Repetitive Behaviors (BFRBs): The Complete Guide

What is a BFRB?

Body-focused repetitive behaviours (BFRBs) are a group of habits involving repeated actions directed at one's own body that cause physical damage and are difficult to stop despite repeated attempts. The category includes nail biting (onychophagia), skin picking (excoriation disorder), hair pulling (trichotillomania), cheek or lip biting, and a handful of related behaviours like nose picking (rhinotillexomania) at clinical severity.

What unites them isn't the specific body part or action but the underlying pattern: automatic, repetitive, self-directed behaviour that provides some form of sensory or emotional regulation, causes real physical consequences, and resists simple willpower-based stopping — the same core mechanics that make nail biting specifically so persistent.

The BFRB family

The major recognised BFRBs, and how they typically present:

• Nail biting (onychophagia) — biting nails, cuticles, or surrounding skin; the most common BFRB, affecting an estimated 20–30% of adults.
• Skin picking (excoriation disorder) — repetitive picking at skin, often at perceived imperfections, causing lesions and scarring; frequently co-occurs with nail biting.
• Hair pulling (trichotillomania) — pulling hair from the scalp, eyebrows, or eyelashes, resulting in noticeable hair loss; among the more clinically studied BFRBs.
• Cheek and lip biting — chewing the inside of the cheek or lip, sometimes to the point of sores; often overlooked as a BFRB because it's less visible than nail biting.
• Nose picking (rhinotillexomania) — at low frequency this is near-universal and not clinically significant; at high frequency and with resulting tissue damage it's recognised as a BFRB.

What they share neurologically

Across BFRBs, the behaviour tends to be encoded as a habit loop stored largely in the basal ganglia rather than driven primarily by conscious deliberation — meaning the actions often occur with limited real-time awareness, are triggered by similar states (stress, boredom, deep focus, fatigue), and produce a brief sensory or emotional payoff (tension relief, stimulation, a sense of "finishing" something) that reinforces the loop over time.

Studies of BFRBs collectively also find elevated rates of co-occurrence with each other — someone who bites their nails is meaningfully more likely than the general population to also pick at their skin, for instance — and elevated (though not universal) rates of co-occurring anxiety and OCD-spectrum symptoms, consistent with their DSM-5 grouping near obsessive-compulsive and related disorders.

How treatment differs by BFRB type

Habit Reversal Training is the common evidence-based backbone across nearly all BFRBs — awareness training, a competing response, and external feedback apply regardless of whether the target behaviour is nail biting, skin picking, or hair pulling. Where treatment diverges is in the specifics of the competing response and the environmental modifications, which need to fit the particular behaviour: keeping nails filed short and hands occupied for nail biting; keeping skin moisturised and covering high-pick areas for skin picking; using specific hair-pulling-aware tools (like a "fidget" object positioned near where pulling typically happens) for trichotillomania.

For hair pulling and severe skin picking specifically, N-acetylcysteine (NAC) has more established research support than it does for nail biting, and some clinicians will suggest it as an adjunct for those particular BFRBs more readily than for nail biting alone.

Finding support

Because BFRBs as a category are less well known than more commonly discussed conditions like generalised anxiety, many people who bite their nails, pick their skin, or pull their hair have never been told these are a recognised, named, treatable group of behaviours — which can itself add unnecessary shame to something that's genuinely well understood clinically.

If you experience more than one BFRB, or if your primary BFRB is causing significant distress or physical damage, it's worth seeking a therapist with specific BFRB experience rather than general anxiety-focused therapy, since the treatment approach (HRT-based, behaviourally focused) differs somewhat from standard talk therapy for mood or anxiety alone.