Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Beau's lines
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Beau's lines: Transverse lines or grooves across the fingernails, or transverse depressions in the nail plate, from temporary disturbance of cell division where the nail develops. The condition may be caused by local disease or injury of the nail fold, or from a generalized condition such as an illness or a drug, for example, chemotherapy.