46 year old male, light smoker, light drinker, eat healthy, good shape both physical and mental. Been having sporadic chest pains (sometimes sharp like a knife or dull, achy), lasting only seconds at a time. Very sporadic in occurrence. Sometimes days or weeks without any signs. Left side, center and right side chest. Sometimes light headed feelings accompany the pains. Blood pressure is good, blood work is good, no cholesterol problems. Had treadmill stress test 1 year ago. Better results than normal according to testing physician. Could this be signs of lung tumor?