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Onychotillomania is a compulsive behavior in which a person picks constantly at the nails or tries to tear them off. [1] It is not the same as onychophagia, where the nails are bitten or chewed, or dermatillomania, where skin is bitten or scratched.
Scraping a chalkboard (also known as a blackboard) with one's fingernails produces a sound and feeling which most people find extremely irritating. The basis of the innate reaction to the sound has been studied in the field of psychoacoustics (the branch of psychology concerned with the perception of sound and its physiological effects).
Onychomancy: fingernails analysis. Onychomancy or onymancy (from Greek onychos, 'fingernail', and manteia, 'fortune-telling') is an ancient form of divination using fingernails as a "crystal ball" or "scrying mirror" and is considered a subdivision of palmistry (also called chiromancy).
A nail is homologous to a claw but is flatter and has a curved edge instead of a point. A nail that is big enough to bear weight is called a "hoof". (Nevertheless, one side of the cloven-hoof of artiodactyl ungulates may also be called a claw). Every so often, the growth of claws stops and restarts, as does hair. In a hair, this results in the ...
An ingrown nail, also known as onychocryptosis (from Greek: ὄνυξ (onyx) 'nail' and κρυπτός (kryptos) 'hidden') is a common form of nail disease.It is an often painful condition in which the nail grows so that it cuts into one or both sides of the paronychium or nail bed.
Manicures, nail polish and remover, nail biting, and repeated trauma such as typing, can contribute to nail splitting. [1] Dehydration likely plays a role. [3] Nutritional deficiencies that can result in nail splitting include iron, selenium, and zinc. [1] Some skin diseases such as psoriasis and lichen planus may feature such nails. [3]
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There have been many different theories regarding the causes of excoriation disorder, including biological and environmental factors. [10]A common hypothesis is that excoriation disorder is often a coping mechanism to deal with elevated levels of turmoil, boredom, anxiety, or stress within the individual, and that the individual has an impaired stress response.