Acute laryngitis can occur in any season, with winter and spring being the most common. It is common in infants and children. When many parents find that their child has a cough and hoarseness, they mistake it for a common cold and take it lightly, giving anti-inflammatory drugs and cough suppressants, or not treating it at all. This often delays the condition and can even be life-threatening. The main clinical manifestation of laryngitis is a cough, which is different from a normal cough, with a dry, cracked voice like a barking dog. It also has a low, hoarse vocalization and a laryngeal tinnitus. As the disease progresses, some patients become irritable, cry, refuse to eat, sweat profusely, breathe faster, and have difficulty breathing. Further progression of the disease may result in death by asphyxiation. There are four levels of risk: Level 1: Aspiration laryngeal tinnitus and dyspnea after activity, with clear breath sounds in the lungs. Heart rate does not change. Grade 2: Laryngeal tinnitus and aspiratory dyspnea occur during quiet periods. Heart rate increases. Grade III: In addition to the above symptoms, there is irritability, cyanosis of lips and fingertips, round eyes, panic, excessive sweating, and diminished breath sounds in the lungs. Heart rate is increased. Grade IV: A state of failure with lethargy and weakness of breathing. The sternal supraspinal depression is not obvious. The face is pale and gray, and the respiratory sounds in the lungs are absent on auscultation. Heart rhythm is irregular. When a child has laryngitis manifestations must immediately send the child to the hospital for treatment, and must not be entrusted. Mild cases can be treated with oral medication under the guidance of a doctor. Moderate and severe cases must be hospitalized.