The abnormalities of the fingernails it can be for alterations of the color, of the form a thickness and spots and that can affect those of the hands or of the feet. The fingernails can reflect the state of health of the persons.

The dotted injuries of the fingernail correspond to the presence of small depressions in the surface of this one, which produces slimming and sometimes the fall of the fingernail.
There can appear lines that rise in any orientation.
The lines of Beau are, on the contrary, linear depressions that appear towards the sides in the fingernail of the finger of the hand and can happen after an illness, an injury of the fingernail and when the person is undernourished for serious illnesses or after a big surgery.

The leuconiquia is when white points appear in the fingernails.

The coiloniquia is an abnormal form of the fingernails of the fingers of the hand where the fingernail has elevated combs and is thin and hollow. It can appear in the anemia states.

The traumatism of the bed ungueal, or the withdrawal of the skin of the bed can give a table aspect of washing to the fingernail.
The frequent exhibition to the moisture or to nail polish can give fragility and descamación of the fingernails.
The infection for fungi they produce changes in the color, the texture and the form of the fingernails. If the same is for bacteria but it gives pain and the fall of the fingernail can take place.

The papillomas or warts can cause a change in the form of the fingernail or the leather embodiment under her.
In some infections, as of the valves of the heart, subungueal can produce linear hemorrhage.

The fingernails that they accompany to the fingers in drum toothpick are those of crystal form of clock or hipocráticas, they usually appear in chronic illnesses of lung or of heart.

The illnesses of the thyroid gland usually give fragile fingernails and another problem of the kidney and liver they can modify the texture also.

In the psoriasis it can produce small cracks, and especially separation in layers of the plate ungueal and of the bed ungueal (onicólisis).

The poisoning with arsenic can cause white lines and horizontal combs.

The silver consumption can cause bluish coloration of the fingernail.