Connection between histological type of lung cancer and existence of clinical and spirometric symptoms of COPD was analysed in 110 lung cancer patients (64 small cell, 23 adenocarcinoma, and 23 squamous). It was shown that adenocarcinoma was significantly more frequent among subjects with values of FEV1%VC over 70 than among subjects with small cell and squamous lung cancer. Also subjects with values of FEV1% VC over 70 had significantly higher oxygen blood pressure, and clinical and radiological symptoms of COPD were less intensive than in subjects with values of this index below 70. There was no correlation between histological type of lung cancer and bronchoscopic symptoms of bronchitis and radiological symptoms of emphysema.