We often do not notice them, but nails can be one of the indicators of the problems our body faces. Of course, the signs may be different, but we suggest visiting a specialist when you notice:

Nails in a very dark color
According to dermatologist and CEO of "Art of Demratology", New York, Jessica Krant, the causes can be different: natural, stroke, pigmentation change due to genetics, but when all of a sudden and so very quickly your nails start to darken we may have a serious case like melanoma of the nail, a type of skin cancer.

Gray or green nails
If you notice a dark gray or green color, you may be suffering from a fungal infection on your nails.

Blue
nails If your nails are getting a blue tinge, it means your fingers are not getting enough oxygen. This can be a sign that the blood circulation in your hands is not functioning properly and is linked to a lung or heart disease.

White nails
The causes are different, but the most serious case is a liver disease.

Thinning
nails If your nails start to thin or break, you may be suffering from iron deficiency and anemia.

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Source: Women's Health