title: Onychorrhexis
text: # Onychorrhexis
  
  Onychorrhexis (from the Greek words ὄνυχο- ónycho-, "nail" and ῥῆξις rhexis, "bursting"), is a brittleness with breakage of finger or toenails that may result from hypothyroidism, anemia, anorexia nervosa or bulimia, or after oral retinoid $therapy.^{:786}$ It can also be seen in melanoma that involves the nail and onychomycosis.
  
  Onychorrhexis affects up to 20% of the $population.^{:786}$
  
  