Our expert says:
this is called Beau's lines. It is caused by a temporary cessation of growth in the nail due to infection or problem in the nail fold, where the nail begins to form, or it may be caused by an injury to that area. Some other reasons for this could be heart disease, low calcium, skin disease, diabetes, psoriasis, certain drugs—including beta blockers or chemotherapy or even malnutrition. Please see your doctor for a thorough medical examination.
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