I have been on Synthroid and Thyroid (Armour) for hypothyroidism for two years. I have very weak, thin, finger nails that break or split horizontally and/or vertically, moons only on my thumb and 1st fingers, multiple thin ridges going up and do
wn on my nail beds & a few fingernails
that are flat
or bend under.
I also have mitral valve prolapse with regurgitation - grade 3. Are my fingernails
indicative of either my thyroid or heart problem?