Blue fingernails can be a sign of various disorders.Very cold temperatures can temporarily slow the flow of blood through the skin leading to the bluish color, but this typically goes away when you warm up. In Raynaud's disease the fingers and toes blanch, then turn blue and may become numb or painful on exposure to cold due to oversensitivity of nerves controlling blood flow through small arteries in peripheral areas of the body,
Blue fingernails can also be due to low hemoglobin and also due to different lung and breathing problems, including asthma, emphysema, chronic obstructive pulmonary disease, chronic bronchitis and other respiratory disorders and heart problems.If your nails remain blue, I suggest having a medical checkup to identify the underlying cause.Your physician will probably want to do some tests to check your heart, lungs and hemoglobin.
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Annual Checkup
It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.
The American Dental Association recommends dental cleanings for adults at least twice annually. Some stains can only be removed by a professional cleaning.
It’s recommended by the American Academy of Ophthalmology that every adult between the ages of 18 and 80 does an eye examination at least once every two years.
It's recommended by the American Cancer Association that every adult between the age of 20 and 80 does an annual skin screening by a licensed dermatologist.
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