A 26-year-old female asked:
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i recently noticed raised horizontal ridges that run across my fingernails in a crescent moon shape same color as my nail. what causes this?

2 doctor answers
Dr. John Despain
36 years experience Dermatology
Beaus lines: Interruptions in the nail growth plates cause these horizontal ridges. Usually due to severe illness a few months ago.
Answered on Jan 25, 2020
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Dr. Heidi Fowler
24 years experience Psychiatry
Unsure: Horizontal nail ridges (or Beau’s lines) run across nail & might be signs of diabetes, thyroid disease, kidney disease. They may occur in people who had syphilis or muscles or who had chemotherapy. These should be evaluated.
Answered on Nov 2, 2018

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