Hand fingers nail having light blue lines: My all fingers having light blue lines and thumbs nails color is little bit more blue line from childhood. I didn't go to see the doctor but I thought there might be some problems so please suggest me and give me causes, treatment and prevention. Thanks in advance.

Dr. Sajeev KumarGeneral Physician32yrs exp

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Blue fingernails are caused by a lack or low level of circulating oxygen in your red blood cells. This condition is known as cyanosis. It occurs when there isn?t enough oxygen in your blood and the skin or membrane below the skin turns a purplish-blue color.The discoloration of the skin could also represent a high level of an abnormal form of hemoglobin in the blood circulating throughout your body. Hemoglobin is the protein responsible for transfer oxygen in your blood. Cold temperatures can also cause your fingernails to turn blue. That?s because cold temperatures force your blood vessels to constrict. 

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