The difference between chronic bronchitis and allergic bronchitis is different etiology, different symptoms, different course of the disease, different treatments, etc. 1. Different causes: the cause of chronic bronchitis is still unclear, and it is considered to be caused by viral, bacterial, mycoplasma and other pathogen infections, and it may also be caused by airway hyperreactivity, impaired immune function and other reasons. Allergic bronchitis is mainly caused by exposure to allergens, immune dysfunction and other factors. 2. Symptoms are different: patients with chronic bronchitis will have recurrent cough, wheezing, shortness of breath, coughing up sputum and other symptoms. Allergic bronchitis patients, generally in contact with allergens will appear nasal congestion, runny nose, sore throat, hoarse voice, long-term persistent cough and other manifestations. 3. Disease duration is different: chronic bronchitis has a long duration, the onset of the disease will last 3 months or longer each year, some patients with chronic bronchitis will last 2 years or more than 2 years. Allergic bronchitis usually flares up when exposed to allergens, and the symptoms will be relieved when not exposed to allergens. 4. Different treatments: For patients with acute stage of chronic bronchitis, antibiotics such as levofloxacin and amoxicillin can be given to patients with clear bacterial infection. For patients with severe dry cough, you need to follow the doctor’s advice with dextromethorphan, pentoxyverine and other cough suppressants. If the patient has wheezing, theophylline drugs such as aminophylline and doxophylline should be used as prescribed by the doctor. If the patient develops allergic bronchitis then antihistamines such as loratadine and cetirizine need to be used under medical supervision. It is recommended that patients with chronic bronchitis or allergic bronchitis need to consult a doctor in a timely manner and follow the doctor’s instructions to actively treat. The above drugs should be used under the supervision of a physician.