I haven't a clue what the exact connection is between thyroid and nails, but I know there is one. My podiatrist suggested I had thyroid problems when he saw the ridges across my toenails. Nails in general are a good indicator of health.
Before starting on 2 grains of westhroid a day, my nails flaked off in layers and i had no moon cresents.They are beginning to grow now and i have moon cresents now in all but my pinky fingernail.How very strange It seems to me that this thyroid deal should be obvious to the doctors but for me it has been a constant struggle and a lot of different doctors just to get treatment.
I find this subject very interesting. I am Chinese and I know Chinese Herbalists always check our nails. Don't know what they are checking though. For now, I have moon crescent on both thumbs. Had one side thyroid removed in Feb. Hopefully moon crescent will show up on the other eight nails in the future.
Here's some info from [url]www.lef.org[/url] about nails and health
When nails do not grow properly or have abnormalities, the cause is often a nutritional deficiency stemming from an unbalanced diet, digestive problems, absorption problems, or eating disorders. The following list includes nutritional factors affecting the nails when there is a lack of vitamins, minerals, and trace elements in the diet.
* A lack of vitamin A and calcium causes dryness and brittleness.
* A vitamin B deficiency causes fragility of the horizontal and vertical ridges in the nail.
* A vitamin B12 deficiency leads to rounded and curved nails.
* A lack of protein, folic acid, and/or vitamin C causes hangnails.
* A lack of "friendly bacteria" (Lactobacillus sp.) leads to fungus under and around the nails.
* A deficiency of hydrochloric acid contributes to splitting nails.
* Low iron may cause concave or "spoon" nails and/or vertical ridges (see Iron Deficiency).
Iron deficiency anemia affects 20% of women, 50% of pregnant women, and 3% of men. It can be caused by too little iron in the diet, poor bodily absorption of iron, heavy menstrual bleeding, or other loss of blood. In addition to pregnant or lactating women, children in rapid growth stages have an increased requirement for iron. People with a diet consisting of little or no meat or eggs for a sustained period may also suffer from iron deficiency. Symptoms of anemia are pallor, fatigue, weakness, shortness of breath, low blood pressure, decreased appetite, and brittle nails. Iron deficiency anemia can also cause a condition called koilonychia in which the fingernail is thin and concave, and has raised ridges. If these symptoms are present, dietary iron supplements should be taken.
Have a blood test to measure ferritin levels in order to ensure that supplementing with iron is necessary prior to taking any iron supplements.
Yeah, I've got small half-moons on my thumbs, but otherwise nothing. Also quite marked longitundinal ridges on my fingernails (especially on my little fingers). Studying fingernails/toenails could become quite obsessive!!!
Since we can only get test results once or twice a year to monitor our thyroid, the least we can do for ourselves is to monitor our nails, and basal temperature too. By the way, I have those longitudinal ridges on all my nails too. Wonder if they will go away.