毛细支气管炎发病急骤，多呈连续性干咳，干咳不久，便出现气喘，为呼气性呼吸困难，喉头发出哮鸣声音，大都伴有鼻翼煽动，口唇不同程度的发绀，严重时可出现三凹征，面色苍白，烦躁不安，听诊两肺满布喘鸣音，往往伴有细湿罗音。常以“喘憋”来形容其严重性。其发病多因呼吸 Bronchiolitis, a sudden onset, mostly continuous dry cough, dry cough soon, they appear asthma, exhaled breathing difficulties, the throat issued a wheezing sound, mostly accompanied by nose incitement, varying degrees of cyanosis lips, severe may appear three concave Levy, pale, irritable, auscultated lungs covered with wheezing, often accompanied by fine wet rales. Often “breathing” to describe the seriousness. Its incidence and more due to breathing