Dryness, itching and foreign body sensation in the throat are the clinical symptoms of acute laryngitis. Acute laryngitis (acutelaryngitis) is an acute inflammation of the mucous membrane of the larynx, often secondary to acute rhinitis, sinusitis, acute pharyngitis, as part of the whole upper airway infection, can also occur alone. Acute laryngitis can also be caused by shouting, excessive use of the voice, and violent coughing. If it occurs in children, the condition is more serious. The causes of dry and itchy throat 1, the body resistance is lowered: after the cold and flu, the whole body resistance is lowered, can induce acute laryngitis. At the beginning, it is mostly viral infection, and then bacteria take advantage of the situation (which is common with pneumococcus, influenza bacillus, hemolytic streptococcus, etc.). Occupational factors: excessive use of voice by actors, teachers, salesmen, etc.; inhalation of excessive productive dust or harmful gases (such as chlorine, ammonia, bromine, iodine, nitric acid, sulfuric acid, pesticides, etc.) by workers in factories and mines. 3.Acute infectious diseases: This disease often occurs in combination with acute infectious diseases such as measles, whooping cough, influenza and scarlet fever. 4.Trauma: foreign body irritation in the larynx, injury of inspection instruments (e.g. direct laryngoscope, tracheoscopy when touching).