causes of bronchial breath sounds

Primary Causes

Pneumonia (consolidation from bacterial, viral, or fungal infection)

Lung abscess or cavitary lesions (e.g., necrotic tumor, tuberculosis cavity)

Bronchiectasis (dilated airways with chronic inflammation)

Pleural effusion (over compressed underlying lung)

Atelectasis or lung collapse (obstructive or compressive)

Secondary Causes

Pulmonary fibrosis (scarring stiffens parenchyma)

Pulmonary edema (fluid overload in alveoli)

Large tumors compressing airways