Chronic bronchitis is a chronic non-specific inflammation of the trachea, bronchial mucosa and surrounding tissues. The main clinical symptom is cough and sputum, and the onset lasts for 3 months each year for 2 or more years. Other diseases with symptoms of cough, cough and wheezing need to be further excluded (e.g. tuberculosis, pneumoconiosis, lung abscess, heart disease, cardiac insufficiency, bronchiectasis, bronchial asthma, chronic nasopharyngitis, esophageal reflux syndrome and other disorders). The disease starts slowly, has a long course, and is aggravated by repeated acute attacks. The main symptoms are cough, sputum, or wheezing. Acute exacerbation refers to a sudden increase in symptoms such as cough, sputum, and wheezing. The main cause of acute exacerbation is respiratory tract infection, and the pathogens can be viruses, bacteria, mycoplasma and chlamydia. Indoor air should be kept clean and fresh. The winter is cold, especially insulation and warmth should be used to avoid relapse by cold. Avoid stimulation by oil and smoke to reduce coughing symptoms. Smoking and alcohol must be strictly abstained from, especially alcoholic beverages. Avoid contact with suspected allergens such as asphalt, pollen, cold air, paints, dust, pesticides, insecticides, etc. to avoid triggering acute attacks. Chronic bronchitis in the elderly often recurs in acute attacks, so when the acute phase is under control, medication, diet, reasonable living arrangements and exercise should be continued in order to improve physical fitness and resistance to disease and to avoid recurrent acute attacks of the disease. When an acute attack occurs, treatment should be carried out in a timely manner to avoid delaying further damage to the trachea and lung tissue and worse lung function. It is advisable to achieve “three high” and “four low” dietary regimen. The “three highs” are high protein, high vitamin and high fiber. Therefore, it is advisable to eat more lean meat, soy products, fish, mushrooms and other high protein food and vegetables and fruits, beans, dairy, black fungus and other foods containing more vitamins; and food, bran, vegetables and other foods belonging to high fiber should be eaten regularly to help increase nutrition, improve physical fitness and smooth stool, eliminate toxins. “Four low” that diet should pay attention to the consumption of low cholesterol, low fat, low sugar, low salt diet.