Bronchoalveolar breath sounds are mixed breath sounds characterized by both bronchoalveolar and alveolar breath sounds. The nature of the breath sounds is similar to the normal alveolar breath sounds, but with a higher and louder pitch. The nature of the expiratory sounds is similar to that of bronchial breath sounds, but the intensity is slightly weaker, the pitch is slightly lower, the tubular nature is less and the expiratory phase is shorter, and there is a very short gap between inspiration and expiration. The inspiratory and expiratory phases of bronchoalveolar breath sounds are approximately the same. 1, symptomatic examination normal people in the sternum on both sides of the 1st to 2nd intercostal space, interscapular area of the 3rd to 4th thoracic vertebrae level as well as the tip of the lungs in front of and behind the bronchoalveolar respiratory sounds can be heard. The nature of the breath sounds is similar to that of normal alveolar breath sounds, but with a higher and louder pitch. The nature of the expiratory sounds is similar to the bronchial breath sounds, but the intensity is a little weaker, the pitch is a little lower, the tube-like nature is less and the expiratory phase is shorter, and there is a very short gap between inspiration and expiration. 2.Provocation test The provocation test is a test to simulate the natural onset conditions and to determine the allergens with a small amount of sensitizers to cause a mild attack of allergic reactions. Mainly used for type I allergic reactions, sometimes also used for type IV allergic reactions, especially in the skin test or other tests can not get a definite result, this method can exclude the skin test in the false-positive reaction and false-negative reaction. Stimulation test or divided into specific stimulation test and non-specific stimulation test. Non-specific excitation is to use histamine or methacholine to do fog inhalation, in order to observe the patient’s sensitivity to type I allergic reaction, so as to carry out the etiological analysis or efficacy determination; specific excitation is to use the antigen to do the test, which is valuable for clarifying the allergens. According to the different parts of the patient’s pathogenesis, different organ excitation test can be carried out, and bronchial excitation test (BPT), nasal mucous membrane excitation test and conjunctival excitation test are often done. 3.Endoscopy Endoscopy is a kind of optical instrument, which is sent into the body from outside the body through the natural cavity of human body to check the diseases in the body, which can directly observe the lesions in the internal cavity of organs, determine their parts and scope, and can be used for taking photos, biopsy or brushing, which greatly improves the diagnosis accuracy rate of cancer and can be used for certain treatments. It is suitable for the diagnosis of bronchial lesions, upper gastrointestinal tract lesions, lower gastrointestinal tract lesions and ear, nose and throat lesions.