Whether children with bronchitis and coughing for a long time lead to variant asthma or both diseases, the severity of the disease is related to the degree of symptoms. Symptoms such as fever, cough and phlegm are not serious, while episodes of wheezing and breathlessness are more serious. Bronchitis is mainly caused by viral infection of the respiratory tract. Variant asthma is related to the patient’s allergic constitution and immunodeficiency, and is often caused or aggravated by allergens, respiratory infections, cold air, and excessive exercise. It is not considered serious if the patient only has mild symptoms such as fever, cough, phlegm and chest tightness. If symptoms such as dyspnea, inability to lie down, episodes of wheezing, shortness of breath, drowsiness, cyanosis, dehydration, etc. occur, they are more serious. In severe cases, complications such as heart failure and respiratory failure can develop. When patients suffer from bronchitis and variant asthma, regardless of the severity of the disease. They should seek medical attention and begin targeted treatment as soon as possible under the guidance of a doctor.