A low level or lack of oxygen circulating in your red blood cells can cause blue fingernails. Other causes can include chronic conditions and cold temperatures. This condition is known as cyanosis.

Let's start by saying that we are loving Jeopardy!’s Invitational Tournament ... it feels like Ken Jennings is dragging his fingernails across a hidden chalkboard on his lectern, and it turns ...

Blue nails may indicate that the blood is not carrying enough oxygen to the fingertips. There are many possible causes, including heart and lung diseases. Anyone with blue nails should seek ...

Blue nails. Diffuse blue nails can be a sign of Wilson’s disease, which is caused by excess copper accumulating in the organs. Diffuse blue nails can also be caused by the HIV drug Zidovudine ...