Most of the lung nodules do not have obvious clinical symptoms in the early stage, but a few people may have cough or sputum symptoms. 1. In the early stage, the impact on the structural organization and function of the lungs is not great, so most patients do not have obvious symptoms. A few patients may occasionally experience irritating cough and sputum, or chest pain, but the symptoms are not serious. 2. If the nature of the nodule is malignant and highly invasive, it may lead to faster growth and may invade the surrounding blood vessels or nerve tissues, resulting in coughing, sputum and blood in sputum, as well as low-grade fever and lethargy, and in severe cases, multi-organ metastasis may also occur. If you have lung nodules, you can go to the hospital regularly for review and timely treatment if necessary.