Multiple pulmonary nodules, which are imaging findings, are usually the result of exposure to dust, pathogenic infections, and metastatic cancer in the lungs, etc. Most patients are asymptomatic, and a few may have symptoms such as cough and hemoptysis. Multiple pulmonary nodules are round-like dense shadows of various sizes in the lungs when patients undergo lung imaging. Multiple pulmonary nodules can usually be caused by inhaling more dust and depositing it in the lungs, or by infection by pathogens such as bacteria and viruses, and can also be seen in patients with metastatic cancer in the lungs. Most patients do not have obvious symptoms, and a few patients may have symptoms such as cough, hemoptysis, fatigue and loss of appetite. Patients with multiple pulmonary nodules should go to the hospital in time if they feel unwell, and be treated under the guidance of doctors, avoiding blind medication.