Onychorrhexis
Onychorrhexis, is a brittleness with breakage of finger or toenails that may result from hypothyroidism, anemia, anorexia nervosa or bulimia, or after oral retinoid therapy. It can also be seen in melanoma that involves the nail and onychomycosis.AAFP 10/2021">
Onychorrhexis affects up to 20% of the population.