Nail-biting is regarded as a bad habit at the best of the times and a form of addiction at worst, but still over 30 per cent of people do it. So just what leads someone to habitually chew on the ends of their digits? According to research, there are four main reasons why people bite their nails: It feels good: A professor of psychology at UCSF (University of California, San Fransico), Tracy Foose, says it feels "relaxing" to bite one's nails. Because of the unconscious enjoyment people get from biting nails it can be calming and comforting in a high intensity situation.

https://www.thehits.co.nz/the-latest/do-you-bite-your-nails-here-are-the-reason-why-people-do-it-according-to-science/

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