My fingernails are mounded/crested, especially my thumbnails, and
I've been told this is often a symptom for heart disease
(however, I also chewed my nails quite a bit as a child, so this might have added to it). I am also frequently cold, particularly in my extremities (hands and feet), and wonder if I have poor circulation. From what I've found out at the doctor's, though, my blood pressure always tests as very healthy and athletically fit.