縱向的大多數是正常,少數可能有其他疾病

橫向的少見，一定要看醫生，疾病可能大

“Ridging is another fingernail problem in children and is characterized by raised lines running longitudinally across the nails. It is found in kids who are in their early childhood and usually goes as soon as they reach adolescent age.
Read more at Buzzle: http://www.buzzle.com/articles/fingernail-problems-in-children.html”

   Vertical nail ridges extend from the cuticle to the tip of the nail. Vertical nail ridges are fairly common and nothing to worry about.