Both bronchial asthma and chronic bronchitis are common and frequent diseases of the respiratory system in internal medicine. Bronchial asthma is a common allergic disease, while chronic bronchitis is a chronic nonspecific inflammation of the tracheobronchial mucosa and its surrounding tissues, which is clinically divided into two types: simple and wheezing. The reason why people often confuse them is that they are often confused by the same characteristics, such as the onset of the disease when they both have wheezing, shortness of breath cough, coughing and other manifestations. So, what are the different features that distinguish them? The main aspects are as follows: 1. From the age of onset: bronchial asthma patients mostly develop the disease when they are young or young, and about l/5 of patients have a family history of the disease, while patients with chronic wheezing bronchitis are mostly seen in middle age or elderly people, without a family history. 2, from the onset of the season and the characteristics of the attack: bronchial asthma to spring and autumn incidence is higher, and has the characteristics of episodic, remove the trigger, after the cessation of the attack, the patient can return to normal, no adverse performance, as normal people. In contrast, chronic wheezing bronchitis often develops in the cold season, with recurrent acute attacks as the main manifestation. After the attack is relieved, there is still a long-term chronic performance of cough, wheezing and coughing sputum. 3.From clinical symptoms: bronchial asthma generally does not have a history of chronic cough and cough, but wheezing as the main playing feature. The accompanying cough and sputum is lighter. In contrast, chronic wheezing bronchitis is mostly accompanied by wheezing only after several years of coughing and coughing, and the cough is heavier. Most of them intensify after upper respiratory tract infection. 4, from the signs: bronchial asthma to both lungs covered with expiratory phase mainly croup; while chronic wheezing bronchitis lungs in addition to croup, often wet rhotic sound. 5, from the drug treatment: bronchial antispasmodic drugs are effective for bronchial asthma, while chronic wheezing bronchitis in acute attacks, antibiotics to control infection as the main means.