Laryngitis, divided into acute laryngitis and chronic laryngitis, common symptoms mainly include hoarseness, cough and phlegm. 1. Acute laryngitis: the main cause of infection, excessive use of voice, inhalation of harmful gases, etc., the main symptom is hoarseness, the voice can change from rough and low to hoarse, and in severe cases, the voice can be completely lost. If the laryngeal mucosa occurs in the cicatrization inflammation, coughing, coughing up phlegm and other symptoms can occur. In addition, there are also symptoms of discomfort or pain in the larynx, which usually does not affect swallowing, but there is a risk of airway obstruction when edema is evident. 2. Chronic laryngitis: It can be caused by chronic diseases, such as chronic inflammation of the nasal cavity, sinuses or lower respiratory tract. Hoarseness is the main symptom, the severity varies from person to person, especially after talking a lot of aggravation, slightly relieved after the silence. There is a dry feeling in the throat, even with sore throat, if there is secretion, sticky phlegm can be formed, after coughing out the speech feel relaxed. After the appearance of the above symptoms, it is recommended to actively seek medical attention, after a clear diagnosis and standardized diagnosis and treatment.