Pulmonary nodules are small, round growths in the lungs that can be detected through imaging tests like X-rays or CT scans. They are usually less than three centimeters in size and can be caused by various factors, including infections, inflammation, or benign tumors. Most nodules are not cancerous, but further evaluation is often needed to determine their nature. Doctors may recommend monitoring the nodules over time or performing a biopsy to check for lung cancer or other serious conditions. The management of pulmonary nodules depends on their size, appearance, and the patient's risk factors, such as smoking history or exposure to asbestos.