What are the horizontal ridges on toenails?

Answer

Horizontal ridges on toenails are called Beau's lines. They are lines that run side to side on toenails and fingernails. These lines are caused when cells cease to divide in the nail matrix for a short period of time. It can be caused by an infection, trauma, hypocalcemia, skin disease, or a coronary occlusion. Since there are many causes of this issue, when it is noticed one should get checked out by a doctor to rule out any serious problems.
Reference:
Q&A Related to "What are the horizontal ridges on toenails?"
Blunt physical force or substantial amounts of pressure to the nail can disfigure the nailbed, causing ridges and uneven nail surfaces to form. Excessive water exposure can also be
http://www.ehow.com/info_7876451_causes-ridges-toe...
its near the bottom of the nail and it isn't just like a small line. its a distinct ridge where the top part is higher and the lower part (close to the cuticle) is lower. it's ...
https://answers.yahoo.com/question/index?qid=20110...
Ridges on nails can indicate iron deficiency, poor absorption of vitamins or
http://www.chacha.com/question/why-are-there-ridge...
Cuz they grow like that.
http://wiki.answers.com/Q/What_do_horizontal_lines...
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