Inflammation of the larynx, causing hoarseness. Simple laryngitis usually occurs with infections such as the common cold. Other causes include inhalation of irritants. The larynx's lining becomes swollen and secretes mucus. In chronic laryngitis, caused by excessive smoking, drinking, or vocal-cord use, the larynx is dry and has polyps. Other types are caused by diphtheria spreading from the upper throat, tuberculosis bacteria spreading from the lungs, and advanced syphilis. The last can produce severe scarring and permanent hoarseness.