What Is Onychorrhexis? - longitudinal ridges and/or lengthwise splitting of the fingernails. This condition can be attributed to underactive thyroid, anorexia/bulimia, cancer, chronic dehydration. Can be painful, is definitely unsightly. Gel polish or acrylic nail wraps (done in salon or at home) can help hold the nail together until it grows out past the split. | article from Nails Magazine
Nail Diseases and Disorders Onychorrhexis are brittle nails which often split vertically, peel and/or have vertical ridges. This irregularity can be the result of heredity, the use of strong solvents in the workplace or the home, including household cleaning solutions. Although oil or paraffin treatments will re-hydrate the nail plate, one may wish to confer with a physician to rule out disease.