when you press your nail does it go white and when you release the pressure go blue again. ? it is not normal to get to blue nails but yes if you are like an ice box then extremeties will always go blue first . as you are colder you veins and arteries constrict so to places like ears, fingers, toes will always go the coldest first and turn a bluish colour cos of the blood supply. it is just the bodies way of dealing with the cold. . stick a pair of gloves on and warm them hands. it is prob cos you are cold.
how are you feeling in yourself ?