2. Blue or Yellow Nails
Bluish nails mean your body isn’t transporting oxygen very well. You could have a serious lung or heart condition. If you are having chest pains as well, call your doctor or 911.
Yellow nails most often have a fungal infection. Sometimes, yellow nails can be a sign of severe thyroid disease, lung disease including chronic bronchitis, diabetes, lymphedema, or psoriasis. In some cases, yellow nails can be a sign of jaundice, a dangerous liver condition. They also might be dry and brittle.