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  2. Dermatophagia - Wikipedia

    en.wikipedia.org/wiki/Dermatophagia

    Those with dermatophagia typically chew the skin surrounding their fingernails and joints. They also chew on the bottom of their feet/toes, inside of their mouth, cheeks, and/or lips, causing blisters in and outside of the mouth. If the behavior is left unchecked for an extended period, calluses may start to develop where most of the biting is ...

  3. Nail biting - Wikipedia

    en.wikipedia.org/wiki/Nail_biting

    Nail biting, also known as onychophagy or onychophagia, is an oral compulsive habit of biting one's fingernails. It is sometimes described as a parafunctional activity, the common use of the mouth for an activity other than speaking, eating, or drinking.

  4. Excoriation disorder - Wikipedia

    en.wikipedia.org/wiki/Excoriation_disorder

    Excoriation disorder, more commonly known as dermatillomania, is a mental disorder on the obsessive–compulsive spectrum that is characterized by the repeated urge or impulse to pick at one's own skin, to the extent that either psychological or physical damage is caused. [4] [5]

  5. Autophagia - Wikipedia

    en.wikipedia.org/wiki/Autophagia

    Nail biting; Pulling hair; Chewing fingers (in extreme cases, leading to amputation) Possible causes. This section will focus on the causes for autophagia in humans. There is no single primary cause for autophagia.

  6. Russell's sign - Wikipedia

    en.wikipedia.org/wiki/Russell's_sign

    Russell's sign, named after British psychiatrist Gerald Russell, is a sign [1] defined as calluses on the knuckles [2] or back of the hand due to repeated self-induced vomiting over long periods of time. The condition generally arises from the patient's knuckles making contact with the incisor teeth during the act of inducing the gag reflex at ...

  7. Lesch–Nyhan syndrome - Wikipedia

    en.wikipedia.org/wiki/Lesch–Nyhan_syndrome

    The self-injury begins with biting of the lips and tongue; as the disease progresses, affected individuals frequently develop finger biting and headbanging. The self-injury can increase during times of stress. Self-harm is a distinguishing characteristic of the disease and is apparent in 85% of affected males.

  8. Trigeminal neuralgia - Wikipedia

    en.wikipedia.org/wiki/Trigeminal_neuralgia

    Trigeminal neuralgia (TN or TGN), also called Fothergill disease, tic douloureux, trifacial neuralgia, or suicide disease, is a long-term pain disorder that affects the trigeminal nerve, the nerve responsible for sensation in the face and motor functions such as biting and chewing.

  9. Tardive dyskinesia - Wikipedia

    en.wikipedia.org/wiki/Tardive_dyskinesia

    Tardive dyskinesia is characterized by repetitive, involuntary movements. Some examples of these types of involuntary movements include: Grimacing; Tongue movements; Lip smacking; Lip puckering; Pursing of the lips; Excessive eye blinking; Rapid, involuntary movements of the limbs, torso, and fingers may also occur.

  10. Coffin–Lowry syndrome - Wikipedia

    en.wikipedia.org/wiki/Coffin–Lowry_syndrome

    Coffin–Lowry syndrome is an X-linked disorder resulting from loss-of-function mutations in the RPS6KA3 gene, which encodes RSK2 ( ribosomal S6 kinase 2). Multiple mutations have been identified in RPS6KA3 that can give rise to the disorder, including missense mutations, nonsense mutations, insertions and deletions.

  11. Trichophagia - Wikipedia

    en.wikipedia.org/wiki/Trichophagia

    Symptoms. nausea, vomiting, abdominal pain, and hair loss. Complications. Trichobezoar, Rapunzel syndrome. Trichophagia is a form of disordered eating in which persons with the disorder suck on, chew, swallow, or otherwise eat hair. [1] The term is derived from ancient Greek θρίξ, thrix ("hair") and φαγεῖν, phagein ("to eat"). [2]