When lung nodules appear in human body, there may not be any clinical symptoms, or there may be cough, fever, chest tightness and other manifestations. 1. No clinical symptoms: isolated lung nodules usually have no obvious effect on human body, even if they are caused by malignant diseases such as lung cancer, they will not show clinical symptoms in the early stage, and are usually found during physical examination. 2. Clinical symptoms may appear: some lung nodules may be caused by infections, such as tuberculosis, which may lead to fever, cough, sputum and other related manifestations. Lung nodules may also be caused by tuberculosis, pneumoconiosis and other related diseases, which may lead to diffuse lung nodules and cause respiratory symptoms such as cough and chest tightness. To summarize, the discovery of lung nodules requires a doctor to evaluate the condition and determine the cause of the disease by taking into account the specific clinical manifestations as well as other characteristics.