Is a 0.9 cm nodule with air bubbles in the outer region of the left lung serious?

A 0.9 cm lesion with air bubbles in the outer region of the left lung lobe requires high attention—it is not a minor issue and may indicate local inflammation, pulmonary bulla, or early-stage lesions. There is a risk of disease progression, so prompt medical evaluation is necessary, including contrast-enhanced chest CT scan and sputum examination to establish a definitive diagnosis.

This condition could result from bronchitis spreading and causing localized inflammation. The air bubble might represent alveolar expansion due to inflammatory exudation; if the inflammation progresses, it may worsen coughing and lead to chest tightness. Alternatively, it could be a pulmonary bulla—although 0.9 cm is relatively small, severe coughing or physical strain could cause rupture, leading to pneumothorax and posing a threat to health.

In daily life, strictly avoid smoking and exposure to secondhand smoke, dust, and other irritants. Ensure adequate rest and avoid strenuous exercise and excessive fatigue. Maintain a light yet nutritious diet, emphasizing high-protein foods and fresh fruits and vegetables. Follow a regular sleep schedule to reduce respiratory stress and support recovery.