It is also called blister sound because of the sound produced by the rupture of gas through the blisters formed by secretions in the respiratory tract such as exudate, sputum, blood, mucus and pus during inspiration. Wet rales are additional sounds outside the respiratory sounds, intermittent and brief, often appearing more than once in succession, more obvious during inspiration or at the end of inspiration, sometimes also appear in the early expiration, the location is more constant, the nature is not easy to change, medium and small wet rales can exist at the same time, can be reduced or disappear after coughing. You can prevent this by using the following methods: 1. Using cold water when washing your face can help prevent bronchitis. The resistance of bronchitis patients is weakened due to the long-term suffering of the disease, so bronchitis patients must strengthen the ability to resist the cold. This is a good way to ensure that you wash your face with cold water 4 times a day and keep it for more than 5 minutes each time, so that you can greatly strengthen your resistance to the cold and to the disease. 2. Regular swimming can effectively prevent bronchitis. Bronchitis patients should not only be treated during the onset of the disease and strengthen the control of the disease, but also actively prevent it when the disease is not heavy. One of the effective measures to prevent bronchitis is to actively participate in swimming in the summer. According to medical data, the patient’s lung capacity can be increased by at least 500 ml if he or she insists on swimming for more than 30 minutes a day for more than 90 days, and more percussion massage can effectively prevent the recurrence of the disease. For example, make a fist with both hands and hit your chest and back respectively, repeating alternate blows. At least 2 rounds per day, at least 200 times per round, and 300 times per day is more beneficial to the prevention of the disease. The strength of the percussion can be gradually increased according to their own situation, and the frequency of percussion can also be appropriately accelerated. 3. Prevention and treatment can be carried out through dietary therapy. Prepare 15-20 grams of loquat leaves, 70 grams of stalk rice and a small amount of rock sugar, wrap the loquat leaves in cloth and boil them in water, add stalk rice and water to make porridge after removing the dregs, add rock sugar when it is almost done, and take it twice a day to dispel phlegm heat. 4, prevention through food therapy. Prepare 600 grams of radish, 18 grams of almonds and 300 grams of pig lung, wash together and boil water once and then put into a pot for boiling, and add a little salt after the pig lung is boiled and cooked. Take 2 doses every 7 days to prevent lung deficiency symptoms.