Expectorant

Sputum is the secretion of the trachea, bronchi, or exudates in the alveoli, and does not include mucus from the mouth, nose, and throat. Sputum is a pathological secretion in the respiratory tract that removes secretions in the respiratory tract from the mouth by virtue of the ciliary movement of bronchial mucosal epithelial cells, the contraction of bronchial smooth muscles, and the impulse of airflow during cough. To put it simply: cough with sputum is called sputum, also called wet cough, as opposed to dry cough (commonly known as dry cough, which refers to a cough without sputum or very little sputum). Sputum is common in diseases such as pneumonia, chronic pharyngitis, chronic bronchitis, bronchiectasis, lung abscess, and hollow tuberculosis.