A. Etiology: 1. Infection: It is generally believed that most of the infections occur after the cold, first with viral invasion, followed by bacterial infection. Common bacteria are B. influenzae, staphylococcus, streptococcus, S. pneumoniae, Neisseria catarrhalis, etc. 2, occupational factors: excessive inhalation of productive dust, harmful gases (such as chlorine, ammonia, sulfuric acid, nitric acid, poisonous gas, fumes, etc.) can also cause acute inflammation of the mucous membrane of the larynx. Teachers, actors and conductors who use their voices more often have a higher incidence of acute inflammation of the vocal cords if they vocalize improperly or use their vocal cords excessively. 3, trauma: foreign bodies, examination instruments and other manipulation of the laryngeal mucosa can also be secondary to acute laryngitis. 4. The disease is easily induced by excessive smoking and alcohol, cold, fatigue, and lowered resistance of the machine. The main symptoms are as follows: Acute laryngitis is mostly secondary to upper respiratory tract infection, but can also be a downstream infection of acute rhinitis or acute pharyngitis, so there are mostly inflammatory symptoms of the nose and pharynx. The disease starts with fever, chills and general malaise. 1, hoarseness: is the main symptom of acute laryngitis, the lighter the pronunciation of sound quality lost round, clear, low tone, coarse, the heavier the pronunciation hoarse, serious can only be whispered, or even complete loss of voice. 2.Laryngeal pain: Patients feel discomfort, dryness and foreign body sensation in the larynx, pain in the larynx and trachea, and laryngeal pain is aggravated when vocalizing, but it does not prevent swallowing. 3. Coughing and sputum: Because of the increase of secretion when the laryngeal mucosa is inflamed, there is often coughing, initially dry without sputum, and in the late stage there is mucopurulent secretion, which is thicker and often not easy to cough out, and adheres to the surface of the vocal cords and aggravates hoarseness. Treatment: 1. The main thing is to rest the vocal cords, and it is necessary to prevent whispering instead of articulation, because whispering still cannot achieve articulation rest, and vocal abstinence is an effective treatment measure. 2. Use antibiotics to control the spread of infection. Add steroid hormone if vocal fold redness and swelling is significant. 3.Steam inhalation therapy Use a cup of hot water, a dry towel, put the dry towel around the mouth, nose and between the cup, open the mouth and breathe slowly. The temperature of the steam should not be too high to prevent burns. After treatment a little rest before going out, so as not to be frightened IV. disease. Fourth, prevention: 1, usually strengthen outdoor activities, enhance physical fitness, improve the ability to resist disease. 2, pay attention to climate change, timely increase and decrease clothing, avoid cold and heat. 3, during the flu epidemic, try to reduce the number of outings to prevent infection. 4.Living a regular life, eating and drinking in a disciplined manner, living in a regular manner, avoid catching cold. 5.Maintain oral hygiene, make the habit of brushing teeth and rinsing mouth in the morning, after meals and before going to bed. 6.Eat more pears, raw radish, plums and other fruits as appropriate to enhance the maintenance of the throat. 7, pay attention to rest and minimize activities to reduce the consumption of oxygen. 8, keep the indoor air fresh, the temperature should be 18-20 degrees, humidity should be maintained at about 60%-70%.