Nail disease

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**Nail disease**
*Classification & external resources*

Onychia without granuloma
ICD-10	L 60.
ICD-9	703
DiseasesDB	23092
MedlinePlus	003247
eMedicine	orthoped/421

Nail diseases are in a separate category from diseases of the skin. Although nails are a skin appendage, they have their own signs and symptoms which may relate to other medical conditions. Nail conditions that show signs of infection or inflammation require medical assistance and cannot be treated at a beauty parlor. Deformity or disease of the nails may be referred to as onychosis.

1 Diseases
2 Nail changes and conditions associated with them
3 See also
4 References
5 External links

[edit] Diseases

Onychia is an inflammation of the matrix (surrounding tissue) of the nail with formation of pus and shedding of the nail. Onychia results from the introduction of microscopic pathogens through small wounds.

Onychocryptosis, commonly known as "ingrown nails" (unguis incarnatus), can affect either the fingers or the toes. In this condition, the nail cuts into one or both sides of the nail bed, resulting in inflammation and possibly infection. The relative rarity of this condition in the fingers suggests that pressure from the ground or shoe against the toe is a prime factor. The movements involved in walking or other physical disturbances can contribute to the problem. Mild onychocryptosis, particularly in the absence of infection, can be treated by trimming and rounding the nail. More advanced cases, which usually include infection, are treated by surgically excising the ingrowing portion of the nail down to its bony origin and thermally or chemically cauterizing the matrix, or 'root', to prevent recurrence. This surgery is called matrixectomy. The best results are achieved by cauterizing the matrix with phenol. Another method, which is much less effective, is excision of the matrix, sometimes called a 'cold steel procedure'.

Onychodystrophy is a deformation of the nails that can result from cancer chemotherapy which includes bleomycin, hydroxyurea, or 5-fluorouracil. It can include discoloration of the nail, or dyschromia.

Gryphotic nail with mycotic changes

Onychogryposis, also called "ram's-horn nail", is a thickening and increase in curvature of the nail. It is usually the result of injury to the matrix. It may be partially hereditary and can also occur as a result of long-term neglect. It is most commonly seen in the great toe but may be seen in other toes as well as the fingernails. An affected nail has many grooves and ridges, is brownish in color, and grows more quickly on one side than on the other. The thick curved nail is difficult to cut, and often remains untrimmed, exacerbating the problem.

Onycholysis is a loosening of the exposed portion of the nail from the nail bed, usually beginning at the free edge and continuing to the lunula. It is frequently associated with an internal disorder, trauma, infection, nail fungi, allergy to nail enhancement products, or side effects of drugs.
Onychomadesis is the separation and falling off of a nail from the nail bed. Common causes include localized infection, minor injury to the matrix bed, or severe systemic illness. It is sometimes a side effect of chemotherapy or x-ray treatments for cancer. A new nail plate will form once the cause of the disease is removed.
Onychomycosis, also known as tinea unguium, is a contagious infection of the nail caused by the same fungal organisms which cause ringworm of the skin. It can result in discoloration, thickening, chalkiness, or crumbling of the nails and is often treated by powerful oral medications which rarely can cause severe side effects, including liver failure, although it sometimes responds to a combination of topical medication and periodic filing of the nail surface. Tea tree oil is considered by some people to be as effective as the prescription medication clotrimazole^[1]. Massage the nail bed with a drop of tea tree oil two or three times a day. Another treatment attempt is to apply two drops of distilled white vinegar to the nail base, or, additionally, nail plate and under the nail, two-three times daily for approximately six months or until the fungus is gone. This treatment is very effective but only if followed consistently. The effect results from vinegar's acidity. Another method is to apply products like Vicks Vaporub or Undecylenic acid. The effectiveness of these home remedies is disputed. Physicians treat onychomycosis with antifungal medication, available as special medicinal nail lacquer (for mild forms of onychomycosis) aswell as systemic medication (pills). For advanced onychomycosis, especially if more than one nail is infected, systemic medication is considered necessary to cure the infection.

Subungual hematoma (mild)

Onychophosis is a growth of horny epithelium in the nail.
Onychoptosis is the periodic shedding of one or more nails, in whole or part. This condition may follow certain diseases such as syphilis, or can result from fever, trauma, systemic upsets or adverse reaction to drugs.
Paronychia is a bacterial or fungal infection where the nail and skin meet.

Main article: Paronychia

Koilonychia is when the nail curves upwards (becomes spoon-shaped) due to an iron deficiency. The normal process of change is: brittle nails, straight nails, spoon-shaped nails.

Subungual hematoma occurs when trauma to the nail results in a collection of blood, or hematoma, under the nail. It may result from an acute injury or from repeated minor trauma such as running in undersized shoes. Acute subungual hematomas are quite painful, and are usually treated by releasing the blood via a hole drilled in the nail.

[edit] Nail changes and conditions associated with them

Nail inspection can give a great deal of information about the internal working of the body as well, and like tongue or iris inspection, has a long history of diagnostic use in cantraditional medical practices such as Chinese medicine.

Pliability:

Brittleness is associated with iron deficiency, thyroid problems, impaired kidney function, circulation problems^{[citation needed]}, and biotin deficiency^[1]
Splitting and fraying are associated with psoriasis, folic acid, protein and/or Vitamin C deficiency.
Unusual thickness is associated with circulation problems.
Thinning nails and itchy skin are associated with lichen planus^[2].

Shape and texture:

Clubbing, or nails that curve down around the fingertips with nailbeds that bulge is associated with oxygen deprivation and lung, heart, or liver disease.
Spooning, or nails that grow upwards is associated with iron or B12 deficiency.
Flatness can indicate a B12 vitamin deficiency^[2] or Raynaud's disease^[3]
Pitting of the nails is associated with Psoriasis.
Horizontal ridges indicate stress, and Beau's lines are associated with many serious conditions.
Vertical ridges are associated with arthritis^[1].
Vertical grooves are associated with kidney disorders, aging, and iron deficiency^[1].
Beading is associated with rheumatoid arthritis^[1].
Nails that resemble hammered brass are associated with (or portend) hair loss^[2].
Short small beds are associated with heart disease^{[citation needed]}.

Coloration of the nail bed:

Mee's lines are associated with arsenic or thallium poisoning, and renal failure.
White lines across the nail are associated with heart disease, liver disease, or a history of a recent high fever^[2].
Opaque white nails with a dark band at the fingertip are associated with cancer, cirrhosis, congestive heart failure, diabetes and aging^[2].
Paleness or whitening is associated with liver or kidney disease and anemia^[2].
Yellowing of the nail bed is associated with chronic bronchitis, lymphatic problems, diabetes, and liver disorders.
Brown or copper nail beds are associated with arsenic or copper poisoning, and local fungal infection.
Grey nail beds are associated with arthritis, edema, malnutrition, post-operative effects, glaucoma and cardio-pulmonary disease^{[citation needed]}.
redness is associated with heart conditions.
dark nails are associated with B12 deficiency.
Stains of the nail plate (not the nail bed) are associated with nail polish^[1], smoking, and henna use.

Markings:

pink and white nails are associated with kidney disease^[2].
Parallel white lines in the nails are associated with hypoalbuminemia.
red skin at the base of the nail is associated with connective tissue disorders^[2].
blue lunulae are associated with silver poisoning or lung disorder^[2].
blue nail beds are (much like blue skin) associated with poor oxygenation of the blood (asthma, emphysema, etc)^[2].
small white patches are associated with zinc or calcium deficiency or malabsorption, parasites, or local injury^[3].
receded lunulae (fewer than 8) are associated with poor circulation^[3], shallow breathing habits or thyroid mysfunction^[2].
large lunulae (more than 25% of the thumb nail) is associated with high blood pressure.