I have vertical black lines appearing on all my nails from the past one year or so. I don't the cause of it. Please help me.

Dr. Sajeev KumarGeneral Physician34yrs exp

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Another cause of black lines on the nails is a splinter hemorrhage, which occurs when blood vessels under the fingernail are damaged, often due to injuries, such as hitting. More seriously, a black line or lines on the nails can indicate the presence of melanoma, a dangerous form of skin cancer fingernails are made by living skin cells in your fingers. So a skin condition such as eczema may lead to fingernail ridges. Skin dryness can also cause these ridges. If your body is low in protein, calcium, zinc, or vitamin a, a deficiency can sometimes be revealed by ridges in your fingernails.  

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