did you read what grz posted? check out what she says about lunulae on thumbs.
"If the thumb lunula is too large the heart and circulation is working overtime and eventually this overworks the heart. The person may be exhibiting high blood pressure. Other signs that the heart is working overtime would be the presence of "heart line" on the ear lobe (a line just above the lobe itself) and a pointed tongue. If the tongue is red at the tip, there is a more serious involvement of the heart."