Lung cancer patients can take painkillers before retesting. Taking painkillers before the re-examination of lung cancer patients will not affect the re-examination, and some lung cancer patients should take painkillers in a standardized way when their pain is heavy. When lung cancer is retested, it is necessary to carry out lung CT, blood test and so on, according to the test results, to check the degree of development of the disease. Generally speaking, painkillers do not interfere with the process and result of retesting. If lung cancer patients need to undergo retesting, they should actively communicate with their attending physicians before retesting, keep a good mindset and pay attention to each retesting result. Moreover, patients should follow the doctor’s instruction in choosing painkillers and should not choose them by themselves.