Patient education is an important part of therapy before surgical procedure. A high level of reliable knowledge has a positive effect during the period of convalescence. The study included 60 patients with lung cancer treated at the Department. The research tool was a questionnaire filled in by respondents themselves. Among the patients, 98% felt adequately informed about the planned surgical procedure. However, it should be noted that the level of knowledge about the neoplastic disease is much worse, because 40% of patients believed that they knew little and 8% claimed they knew nothing about it. 46 patients (77%) indicated an attending physician as the main source of knowledge about cancer. The vast majority (92%) was aware of the dangers of tobacco smoke and identified it as the main cause of lung cancer. It has been shown that about half of the respondents rated their knowledge as unsatisfactory, but the vast majority considered surgery as an important stage of treatment. The quality of patients’ knowledge should be verified and expanded, as it positively influences the peritherapeutic process. The family should also be encouraged to support the patient, because it is an important psychological element.