Tearing nails?

Is biting and tearing one's fingernails until they are very short and almost gone a disease too??

Disease? that's too heavy word for tearing nails.
But I think someone who tears their nails has a kind of psychotic problems.

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　　Neck Disorders 　　Neck Injuries 　　Nearsightedness 　　Nasal Cancer 　　Narcotics 　　Narcolepsy 　　Nail Diseases 　　Myositis 　　Myopia 　　Myopathies 　　Myocardial Infarction 　　Myeloproliferative Disorders

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