Chronic obstructive pulmonary disease enhance the risk of lung cancer. A study stated that the prevalence of COPD patients on lung cancer is 2,79%. The patients of COPD that become lung cancer cases often found at the last stage of cancer and the patient that have smoked. This study was aimed to investigate the COPD patients at RSUD Arifin Achmad in Riau province in range year 2013-2018. The de…