Lung nodules may be caused by infection, environmental pollution, smoking and inhalation of irritating gases, and lung cancer. For smaller lung nodules and patients without risk factors for lung cancer, they can be followed up for observation and do not need special treatment. For symptomatic lung nodules that are considered to be caused by infection, anti-infection treatment can be given, which can be cured in general, and for those that are considered to be caused by lung cancer, they can be given treatments such as surgery and radiotherapy, which can be cured in some patients. 1. Environmental pollution, smoking and irritating gases: long-term work and life contact with small particles such as miners and cooks, smoke, dust, oil particles can be inhaled into the lungs through the mouth and nose, plus the self-clearance ability of the respiratory tract decreases over time, easy to occur lung nodules, need to get rid of the polluted environment, generally do not need special treatment, regular follow-up observation can be. 2. Infection: Inflammatory lesions in the lungs caused by bacteria and fungi lead to the occurrence of nodules, which can be cured by anti-infection treatment. 3. If lung cancer is considered, some patients can be cured through surgery and radiotherapy. If there is any discomfort, it is recommended to go to the respiratory department of regular hospitals for treatment and complete relevant examinations for regular follow-up, and not to blindly treat the disease by oneself to avoid delaying the condition.