Bronchopneumonia is a common infectious disease in children and infants and has one of the highest rates of hospitalization in children. Bronchopneumonia is most commonly caused by pathogens such as bacteria, viruses, mycobacteria, Mycoplasma pneumoniae, Chlamydia, and Haemophilus influenzae, and can also be caused by a combination of bacteria and viruses. The inflammation of the lung tissue causes thickening of the respiratory membrane and obstruction of the lower airways, resulting in ventilation and air exchange dysfunction. Conditions The disease can develop throughout the year, but in the north it occurs in the cold winter and spring seasons and when the climate changes rapidly. Indoor crowded living, poor ventilation, air pollution. Malnutrition, vitamin D deficiency rickets, congenital heart disease, low birth weight children, immunodeficient people can be prone to bronchopneumonia. The main symptoms 1, fever: fever type is variable, mostly irregular fever can also be flaccid fever and retention fever. It is important to note that in newborns, the temperature of severely malnourished children may not rise or may be lower than normal (this explains why many moms wonder how my baby got pneumonia without a fever.) 2, cough: more frequent cough, at first for the irritating dry cough, late cough instead of reducing, turning to phlegm, recovery period, there has been an occasional cough with phlegm, not easy to clean. 3.Shortness of breath: mostly appears after fever and cough. 4. Systemic symptoms: mental depression, loss of appetite, restlessness, mild diarrhea, vomiting. Some common signs 1, increased respiration: 40 to 80 times per minute, and visible nasal agitation and inspiratory depression. 2.Cyanosis: cyanosis around the mouth, nasolabial folds and finger (toe) ends, no cyanosis in small babies with mild pneumonia. 3, lung rales: early inconspicuous, there may be coarse breath sounds, reduced, later can be in the back on both sides of the lower and both sides of the spine at the end of deep inspiration can be heard fixed medium-fine wet rales. Blood tests: In viral pneumonia, the white blood cell count is mostly normal or low, but a few are elevated, and sometimes the lymphocytes are elevated, and the C-reactive protein is normal or does not rise significantly. In bacterial pneumonia, the white blood cell count is elevated, neutrophils are increased, and C-reactive protein is elevated. 2, X-ray examination: early chest film lung texture enhancement, the two lung lower field, the middle and inner band appear varying in size dotted or small patchy shadow, or fusion into a large patchy shadow, or even waves of segments.