Okay so I have clubbing of the fingers but also for as long as I remember they have been that way. I recently learned via my nursing program that clubbing is often a sign of serious liver, lung, or heart problem. I have zero other symptoms. I workout and do cardio just fine and work on my feet in a fast paced environment for 7-13 hours at a time. Any insight? I honestly think its a skin condition from biting my nails my whole life. i obviously cant get blood work or liver values done.