Lung nodule itself usually has no special manifestation, but it may be due to pneumonia, tuberculosis, lung adenocarcinoma and other diseases. Different diseases have different symptoms, and the common ones are fever, blood in sputum, cough and other manifestations. 1. Pneumonia: when caused by pathogenic microorganisms, physical and chemical factors, immune injury, allergy and drugs, patients may have fever, cough, chills, accompanied by chest pain, dyspnea and other symptoms. 2. Tuberculosis: It is a respiratory infectious disease caused by infection of Mycobacterium tuberculosis in lung tissues, bronchial tubes, trachea and pleura, and the patient mainly manifests the symptoms of coughing up sputum, coughing up sputum with blood in it and hemoptysis, accompanied by symptoms of low fever and fatigue. 3. Lung adenocarcinoma: This disease may be related to smoking, atmospheric pollution, occupational hazards, chronic lung diseases and so on, resulting in the emergence of lung nodules, with common symptoms such as cough, chest pain, fever and so on. It is recommended that patients go to regular hospitals in time, and under the diagnosis of doctors, according to the patient’s condition, targeted treatment.