This indicates very high triglyceride levels. Where this condition can cause damage around the knuckles.
“A lot of these fats in the blood may play a role in the hardening of your arteries,” explains WebMD.
High triglyceride levels are known to contribute to the risk of developing heart and circulatory diseases. Other potential indications of heart disease can be seen on the nails.
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If your finger never hits, but there are dark spots under the nails, it could be a warning sign of a heart problem.
“Small droplets of blood trapped under your fingernail could indicate an infection in the lining of your heart or valves, called endocarditis,” tells WebMD.
WebMD adds that blue or gray fingers could be an indication of a problem with the heart. Such discoloration could be a result of poor circulation of oxygen-rich blood.
This can be caused by the narrowing of blocked blood vessels, which is a hallmark of heart disease.
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“A lacy, mottled, purple pattern appears when the pieces of cholesterol plaque that form break off and get stuck in tiny blood vessels,” notes WebMD.
“You may get bloody patches just under the skin on the inside of your hand when you have endocarditis.”
Meanwhile, the best way to minimize the risk of a heart attack is to eat healthy, exercise, not smoke, and keep blood pressure and blood sugar under control.