Hypertrophic osteoarthropathy(HOA) is a systemic disorder characterized by proliferative periostitis of long bone and polysynovitis. Clubbing of the fingers and toes usually accompanies HOA. This syndrome is most frequently with lung cancer. Although disappearance of HOA with removal of the tumor is well known, very few typical cases are reported in Korea. We report case of lung cancer with HOA, which was dramatically relieved after the surgical resection of the tumor.