[COPD and bone].

Chronic obstructive pulmonary disease(COPD)is a chronic inflammatory airway disease associated with various systemic comorbidities including osteoporosis. Osteoporosis is extremely common in COPD patients;up to 80%prevalence of vertebral fracture has been reported. However, its low awareness has left many patients untreated. Although pathophysiology of COPD-associated osteoporosis is largely unknown, multiple risk factors for osteoporosis are present, such as smoking, low body weight, systemic inflammation, vitamin D insufficiency, hypoxia. Further research to elucidate its pathophysiology is needed. But, more importantly, increased awareness of its significance is urgently called upon.