What could be the cause of your finger nails going flat,?

starting with the index finger on both hands.What could be the cause of your finger nails going flat,?
Hi, i was busy trying to find out the answer to this one too on google and i came across your question... from what i have read so far it is caused my anemia... lack of iron in the diet. get the green leafy veg out!!!What could be the cause of your finger nails going flat,?
Smoking or arthritis can cause that.
All sorts of diseases cause fingernails to grow distorted.





I have a friend with asthma whose doctor always checks her fingernails for crosswise indentions and for tips that bend down; he says this is and indication of lack of adequate oxygen in the lungs for extended periods of time.