Pelvic changes in both lungs may be due to prolonged bed rest, inflammatory reactions, pathogenic bacterial infections, etc. 1. Prolonged bed rest: two-lung infiltrative changes may be caused by prolonged bed rest, resulting in congestion and edema at the lung base, inability to expel secretions from the lung base, and gravity-related increase in surface tension, leading to accumulation of sputum and alveolar atrophy, resulting in two-lung infiltrative changes. 2. Inflammatory reaction: the two lungs may be infiltrated by bacteria or viruses and other microorganisms that cause inflammatory reaction, resulting in different degrees of alveolar aggregation at the base of the lungs, and when you go to the hospital to do the corresponding examination, you will find that the lower lobes of the lungs have infiltrative changes. 3. Pathogenic bacterial infection: the two lungs drop accumulation change may be due to pathogenic bacterial infection, the respiratory tract clearance ability decreases, resulting in the secretion is difficult to discharge, and then accumulate in the respiratory tract after the pathogenic bacterial infection induced, but also may be related to respiratory muscle paralysis, blood circulation function is reduced, and other factors. If the patient has the condition of two lungs crashing change, it is recommended to consult a doctor in time, under the guidance of the doctor, to take the appropriate treatment plan.