Pale nails Very pale nails are sometimes a symbol of old age. But it may also be a sign of some major diseases, such as anemia, congestive heart failure, diabetes, liver disease and malnutrition. White nails If the nails have large white and black edges, it may indicate that there is something wrong with the liver, such as hepatitis. In this picture, you can see that these nails show the characteristics of jaundice, which is another sign of liver disease. The most common cause of yellow nails is fungal infection. With the aggravation of infection, the nail bed will retract, then the nail will become thicker and thicker, and finally it will break. In rare cases, yellow nails may indicate a more serious disease, such as severe thyroid disease or psoriasis. Broken or cracked nails are dry and fragile, which may be related to thyroid diseases. If the brittle nail turns yellow at the same time, it is more like a fungal infection. Nail fold swelling If the skin around the nail is red and swollen, it is nail fold inflammation. It may be the result of lupus or other connective tissue diseases.