Multiple lung nodules are defined as having two or more lung nodular foci, often detected by chest CT. 1. There are many reasons for the formation of lung nodules, according to the benign and malignant nature of the nodules, they can be divided into benign lung nodules and malignant lung nodules. If suffering from malignant lung nodules, most of the patients are with primary lung cancer, metastatic carcinoma, etc. Benign lung nodules may be caused by benign tumors, infections, or vascular, inflammatory and congenital lesions. 2. Different lung nodules have different clinical manifestations. There may be no obvious clinical manifestations, or cough, cough sputum, chest pain, dyspnea, shortness of breath, hemoptysis and other symptoms. It is recommended that patients go to a regular hospital in time, under the diagnosis of the doctor, according to the patient’s specific condition, to take targeted treatment.