This is a cross-sectional study of clinical features (including prevalence, intensity and impact on life) of cancer-related pain in all lung cancer patients visiting the 20 participating hospitals in northern China on the designated day in July 2017. Meanwhile, all physicians receiving lung cancer patients in these hospitals are also enrolled to evaluate current management of lung cancer related pain in northern China. The patients will be identified in both outpatient clinics and inpatient wards of the involved hospitals. Informed consent will be obtained from participating patients and those who are not willing to provide pain information of interest and refuse to sign the ICF will be excluded.