In early spring, the weather is most prone to sudden cold and heat "tantrums", when respiratory diseases are common. In particular, it is important to remind the elderly that once they have respiratory tract infections, they should not be treated as common colds. If the medication does not work for 3 days after taking a "cold", they should immediately seek medical attention in the hospital for pneumonia screening. Not long before the old man failed to take medicine for a cold, he had to be checked for pneumonia. Kang Laobo, 73, had a respiratory tract infection due to weather changes. He thought he had a cold and didn't go to the hospital for treatment. He went to the drugstore to buy cold medicine to take it. However, after 10 days, the symptoms of the cold not only did not decrease but worsened. "Uncle Kang was in a hurry, and accompanied by his family, he went to the hospital for treatment. The doctor diagnosed pneumonia. Due to the delay in treatment, his condition was not mild, and he had to be hospitalized. If he continued, it might even threaten his life safety.". Although pneumonia is a common respiratory tract infection, it should not be taken lightly. "The initial symptoms of pneumonia are similar to those of a cold, usually manifested as fever and a slight cough.". Patients with severe pneumonia may experience breathing difficulties, severe coughing, and cyanosis of the lips and lips. The elderly are the most vulnerable to lung infections, and pneumonia accounts for an important proportion of the direct causes of death in the elderly. "Because pneumonia in the elderly can simultaneously cause chain reactions in multiple organ systems such as respiratory failure, heart failure, meningitis, and even sepsis or sepsis in severe cases, these chain reactions have a high mortality and disability rate.". In spring, due to the large changes in temperature, the number of elderly people suffering from colds and pneumonia increases. Once the elderly have respiratory tract infections, they should not be treated as ordinary colds. If taking medicine for 3 days after catching a cold does not work, they should immediately seek medical attention in the hospital for pneumonia screening. The diagnosis of pneumonia in the elderly can be made based on the increased ratio of white blood cells to neutrophils seen in blood routine tests, and the location of lung infection seen on X-ray chest radiographs or chest radiographs. After the diagnosis of pneumonia, doctors will treat it symptomatically based on the condition. According to the etiology, pneumonia can be classified into bacterial pneumonia, atypical pathogen pneumonia (such as mycoplasma pneumonia, legionella pneumonia), viral pneumonia, pulmonary mycosis, and pneumonia caused by physical and chemical factors (such as radiation pneumonia, chemical pneumonia caused by gastric acid inhalation, etc.). Bacterial pneumonia is the most common type of pneumonia among patients. Before the use of antibiotics, bacterial pneumonia posed a great threat to the health of children and the elderly. The emergence and development of antibiotics once significantly reduced the mortality rate of pneumonia. For example, for pneumonia caused by pneumococci, doctors will choose drugs such as penicillins and cephalosporins to fight infection according to specific circumstances. For pneumonia caused by atypical pathogens (Legionella, Mycoplasma pneumoniae), doctors will choose macrolides and quinolones for treatment. For some rare bacterial, fungal, and viral lung infections, doctors will choose appropriate medication for the pathogen. It can be seen that drug treatment of pneumonia requires targeted treatment, and patients cannot choose anti infective drugs on their own. Instead, appropriate drugs should be selected according to the doctor's prescription. Viral pneumonia is a type of bronchopneumonia caused by multiple viral infections, which often occurs in winter and spring. The clinical manifestations are generally mild. The main symptoms are dry cough, fever, dyspnea, cyanosis, and loss of appetite. There are fewer physical signs in the lungs, and the white blood cell count is normal