Some people bite their lips when focused as a subconscious self-soothing mechanism. This behavior often acts as a physical outlet during moments of deep concentration or stress, helping to manage overwhelming feelings or assist in channeling attention to the task at hand[1][2].
Additionally, lip biting serves as a subtle form of non-verbal communication. In situations requiring focus, individuals may not even be aware they're doing it, and it can signify various emotional states, such as anxiety or nervousness[3][4][5]. Overall, lip biting during concentration highlights the intricate connection between emotional states and physical behaviors.
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