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Why are my fingernails turning black?

My fingernails are getting darker and I don't know what to do. I'm afraid they are all going to turn black. No explanation for this, like no injuries or anything. What's going on?
There are several potential causes for nails turning darker in color. You will need to see your primary care doctor or your dermatologist, however, to help you get to the bottom of this. By far the most common cause of darkening nails is chemical exposures changing the colors of the nails. The two most common chemical exposures are nicotine (from cigarettes) and nail polishes. If you smoke or frequently use nail polishes, you may want to discontinue them for a while to see if this make a difference. In second place would probably be fungal infections of the nails. These are also very common and they can make nails darkened or yellowed, and often also distorted in contour and thickened. Your doctor would be able to determine if there is a fungal infection and, if so, recommend treatment. Finally, certain serious medical conditions, such as cancer, diabetes, and vitamin deficiencies, may have an effect on the color of the nails. They may also cause the appearance of ridges or lines and they make the nails more brittle or peel up from the nail bed. Start by seeing your doctor; they will be able to rule out serious medical problems and help you figure out what is going on.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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