Lung infections are currently an important group of diseases that threaten the lives of people, especially the elderly, and therefore the prevention and treatment of lung infections is quite important. The following is an introduction to lung infections, and we hope that you will be aware of them and do a good job of early prevention and treatment. I. What is a lung infection? Lung infection refers to the inflammation of the lung parenchyma including the terminal airway, alveolar cavity and interstitial lung. Lung infection is a general term for acute attacks of chronic bronchitis, acute bronchitis, pneumonia, bronchiectasis infection and other infectious diseases of the lung, mainly infections of the lower respiratory tract. Second, the etiology of lung infections: infection is common, but can also be caused by physical, chemical, immune and drug. Such as: inhalation injury, tracheotomy or intubation, aspiration, pulmonary edema, pulmonary atelectasis, shock, surgical anesthesia, invasive trauma infection, septic thrombophlebitis, etc. Common diseases and symptoms of pulmonary infections: 1. Bronchitis: It is a chronic non-specific inflammation of the trachea, bronchial mucosa and surrounding tissues. (1) Patients with acute bronchitis usually have clinical manifestations such as nasal congestion, clear runny nose, sore throat and hoarseness. (2) Chronic bronchitis is often characterized by a long-term, recurrent, and gradually worsening cough, in addition to symptoms of coughing, shortness of breath, and recurrent infections. (2) Pneumonia: Patients have symptoms such as cough, coughing sputum, fever, chest tightness, malaise, dyspnea, etc. In severe cases, infection toxic shock can even occur. 3.Bronchiectasis: The common symptoms are coughing up pus sputum and coughing up blood for a long time. Regarding the treatment of lung infection, you should choose a regular hospital and choose scientific treatment techniques, do not believe in advertising drugs, small clinics and small hospitals, so as not to treat improperly, but to aggravate the condition and increase the difficulty of subsequent treatment.