Pediatric asthma is usually caused by a variety of factors such as the flu or genetics. The symptoms of asthma are more obvious, and the typical symptoms include coughing, coughing, phlegm, wheezing, dyspnea, chest tightness and a series of other symptoms. In children with rapid onset of asthma, symptoms of dyspnea may appear at first, followed by shortness of breath, nasal flapping, trismus in severe cases, cyanosis of the lips and mouth, cough and foamy sputum. When an asthma attack continues unabated, severe hypoxia may cause irritability, sweating, pallor, cyanosis, depression, and a host of other symptoms. Trismus will also be characterized by repetitive chest and abdominal movements, thoracic bulging, prolonged expiration, and mostly extensive expiratory phase dominated by croup. If airway obstruction is severe, breath sounds may be significantly reduced and wheezing sounds may be diminished or even absent. Because pediatric asthma can lead to a lack of oxygen, a series of more common symptoms such as chest tightness, chest pain and difficulty breathing can occur. Pediatric asthma can have a great impact on the growth and development of children, so when a child has the above symptoms, parents should promptly take the child to the hospital for relevant examinations and systematic treatment is needed to confirm the diagnosis of asthma.