I always knew I was not the only person who had the habit of biting his cheek. My mom has a milder version of habit, but she bites her cheeks as well. I read somewhere that its an “Obsessive Compulsive Disorder”.. and lots of people here seem to thinks so too. Also it it might be, to a certain extent, genetic.
I’ve tried to leave the habit, but its never left me. I am 21.. and I’ve had this habit for at least 10 years now. In addition to biting cheeks, I also pull out beard-hair.. from my chin, ever since I’ve grown old enough to have a beard. There is a word of that, “trichotillomania”. I have no self-esteem issues – some information on the net seems to suggest that cheek biting and hair-pulling have to do with a poor self image. I am a happy, optimistic and (if I may add) lucky individual.
I bite my cheek and pull my hair most when I am worried or anxious, or bored.
And yes, sometimes I nibble on my tongue too.