Why Nails Go Blue?

Nails turning blue is a clear indication that your body is not getting enough oxygen. In winters, keep your hands warm because cold temperatures can make your nails go blue. However, if your fingers remain blue even after warming up, then it could be a warning sign of an underlying disease. It could be a side effect of any medication that you are taking. Blue tints can be caused by bacterial infection, pneumonia, heart problems, lung disease, Wilson disease, asthma, and chronic bronchitis.