There are a few reasons for having thick nails but they are commonly caused a fungal nail infection, but can also result from psoriasis and reactive arthritis (a painful form of inflammatory arthritis). White nails – might be a sign of aging, fungal nail infection or iron deficiency (anemia), as well as other range of ailments, such as: cirrhosis (scarring of the liver), kidney or heart failure, diabetes, hyperthyroidism, malnutrition or after chemotherapy. Fingernails that are half white at the bottom and half brown near the tips can be a sign of kidney failure, AIDS or appear after chemotherapy. Grey nails – can be caused by certain medications.īrown nails – can indicate a thyroid disease or malnutrition. Green-black nails – indicate bacterial infection that usually occurs under loose nails.īluish or purple fingernail beds may indicate oxygen deprivation. For more information, read my article about the most common causes of yellow nails. It can also indicate several other ailments, such as: jaundice due to liver problem (also see my other post about early signs of liver damage), sinus infection, a problem with the thyroid gland, lung infection and lymphedema (fluid retention that generally occurs in arms or legs). Yellow nails can occur due to a long use of nail varnish, but can indicate fungal nail infection or psoriasis.
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