A growing body of research reveals how common body-focused repetitive behaviours, such as nail biting and scalp scratching, can develop into disorders linked to stress, genetics, and neurological factors, prompting calls for improved diagnosis and targeted treatment.
A small, automatic act in the shower can reveal how deeply a body-focused habit has taken hold. In this case, the behaviour is not rare or trivial. A study of 1,500 people cited by Die Zeit suggests that repetitive actions such as nail biting, lip biting and scalp scratching are common, but for some people they develop into a disorder that causes injury, shame and wider mental strain. Research in non-clinical adult samples has found that around 23% of participants report some form of body-focused repetitive behaviour, with nail biting the most frequent.
The article centres on Tobias Hoffmann, whose scalp scratching began during a stressful first job and then settled into a pattern that was briefly soothing but ultimately hard to shake. What started as a way to manage tension became a source of embarrassment and, at times, physical harm. That experience fits the wider clinical picture: a study in Scientific Reports found that people with tic disorders often also show body-focused repetitive behaviours, which points to the need to assess both problems together rather than treating them in isolation.
Clinicians increasingly group these habits with obsessive-compulsive and related disorders under ICD-11, reflecting the view that they are not simply bad manners or a lack of willpower. The causes are mixed. Stress is a major trigger, but researchers also point to family modelling, possible genetic influences and individual vulnerability. A structured diagnostic module developed in German-speaking countries has shown high inter-rater reliability, suggesting it could help doctors identify the condition more consistently in practice.
Treatment usually focuses on habit reversal, replacement behaviours and techniques that interrupt the automatic sequence before it starts. Those approaches can help, but the article makes clear they do not always erase the problem, especially when stress returns. That matches the broader research literature, which shows these behaviours often start in childhood or adolescence and can persist into adult life, with nail biting among the most persistent patterns. In people with other neurological or developmental conditions, including FOXP1 syndrome, studies also suggest that body-focused repetitive behaviours may be especially common, underlining the need for targeted support rather than shame.
Disclaimer: This content is for informational purposes only and is not intended to be a substitute for professional medical judgment, advice, diagnosis, or treatment.
