A member asked:

What lacking vitamin causes horizontal lines under finger nails?

A doctor has provided 1 answer
Dr. Heidi Fowler answered

Specializes in Psychiatry

Zinc: (Beau's line) have a variety of possible causes: 1. nail injury (biting nails, crush injury or pressure to nail in runners). 2. Chemicals (some nail polish removers. 3. ) Infections- yeast/ fungus, viral warts. 4. Skin cancer (malignant melanoma). 5. Renal, liver, thyroid diseases, Raynaud's Disease. 6. arsenic poisoning or silver overdose 7. malnutrition. 8. Zinc Deficiency.

Answered 9/11/2017

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