Types of coughs can be identified by their nature, timing and regularity, and tone. 1. Nature (1) dry cough: refers to cough without sputum or sputum amount is very small, common in acute or chronic pharyngolaryngitis, acute bronchitis and so on. (2) Wet cough: cough with sputum is called wet cough, commonly found in chronic bronchitis. 2. Time and pattern (1) Sudden cough: often due to inhalation of irritating gases, foreign body inhalation and so on. (2) Long-term chronic cough: common in chronic bronchitis, bronchiectasis and so on. (3) Episodic cough: common in cough variant asthma, whooping cough and so on. (4) Nocturnal cough: common in cough variant asthma, left heart failure, etc. 3. Tone (1) Hoarseness of cough: most common in inflammation of the vocal cords. (2) Cock-like cough: that is, continuous paroxysmal cough with high-pitched inspiratory echoes, mostly seen in whooping cough. (3) Metallic cough: mostly caused by mediastinal tumor compression of the trachea. (4) Cough with low and weak voice: mostly seen in severe emphysema. Cough can be caused by a variety of diseases, if you feel uncomfortable, it is recommended to consult a doctor in time for diagnosis and treatment.