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Originally Posted by girlygirly Line and ridges in nail are a symptom of hypothyroidism. You may want to go on the thyroid board to see if you have any other symptoms. |
Hypothyroidism 'may' cause the rails and grooves of the nail bed to be seen on the surface of the nail plate; however - when it effects only ONE HAND, it is generally a sign of depleated oil and moisture levels within the nail plate itself.
If the ridging is due to an internal disorder, it would effect all 10 nails.
I have visible ridging on both thumbnails and have had since I was in my early 30's. I am now 55 years old and do not have thyroid disease in any way, shape or form. What I have is inherited (from my Mother) and does benefit somewhat by daily applications of Botanical Oil or Solar Oil. The ridges are visible to the eye, but not when I touch the nail plate surface - it is still smooth.
If the ridges run from the cuticle to the free edge vertically and not horizontially, then it is just a dry nail plate. If the ridges are horizontal, it is generally due to some sort of systemic disease, but will usually effect all 10 nails.