changes in shape can give the nails a concave or spoon-like appearance.
Horizontal Lines
Horizontal ridges, also known as Beau’s lines, are considered a symptom of more serious diseases. These indentations on the nail surface can impede nail growth until the underlying condition is detected and treated.
Beau’s lines are an indication of acute kidney disease, and when they develop on all 20 nails, they suggest the presence of mumps, thyroid disease, diabetes, or syphilis. According to a study published in Acta Haematologica,
