What are the causes of lung nodule formation?

There are several causes for the formation of pulmonary nodules, mainly including: 1. Infection: Pulmonary infections are common causes of lung nodules, such as bacterial, viral, fungal, or parasitic infections. Common diseases include pneumonia, tuberculosis, and aspergillosis. 2. Inflammation: Non-infectious inflammation, such as pulmonary inflammation, pulmonary fibrosis, or granulomatous diseases, may also lead to the formation of pulmonary nodules. 3. Tumor: Tumors are an important cause of pulmonary nodules. Lung nodules may be a sign of early-stage lung cancer but can also result from other tumors such as lymphoma or metastatic cancer. 4. Other factors: Long-term smoking, environmental pollution, occupational exposure, autoimmune diseases, and genetic factors may also contribute to the formation of pulmonary nodules. If you have any concerns, it is recommended to consult a doctor for further evaluation and diagnosis.