Nails problem?

there are black lines on my finger nails and toes. some nails have totally turned black, and others, the thickness is increasing. what's the cause. please help.Nails problem?
This could be a sign or indication of a heart problem. Some patients with inflammation of the heart called ';endocarditis'; can cause this to happen. Make an appointment with your doctor.Nails problem?
Unless it's nail polish, you should go to a doctor!
whoa...that's scary..see a doctor!!

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