Long-term bedridden patients with reduced thoracic mobility, respiratory muscle paralysis, weakened respiratory clearance, coughing, swallowing function is weakened or disappeared, resulting in the inability to cough up the respiratory secretions in a timely manner, completely, the accumulation of secretions in both lungs, the lungs become a culture base for bacteria, thus inducing pneumonia. 1. Long-term bedridden people have less thoracic mobility, the lungs are easy to accumulate secretions, various reasons cause the decline in the movement of pulmonary cilia, coughing, swallowing, sneezing and other protective reflexes become weaker, so that respiratory secretions are not easy to discharge, resulting in lung infections. Abnormal cough reflex is also one of the causes of pneumonia. 2. bedridden patients due to cerebrovascular sequelae, tumors and other basic diseases lead to respiratory muscle paralysis can cause respiratory difficulties, and even pulmonary atrophy, lung atrophy and other conditions, the accumulation of secretions at the base of the lungs increased. 3. Bedridden patients due to tracheotomy or general anesthesia tracheal intubation and other operations, so that the original barrier function of the respiratory tract is destroyed, bacteria invade the lungs, resulting in infection. 4. The blood circulation function of long-term bedridden patients decreases, and the lungs are prone to bruising, leading to complications of pneumonia. Bedridden patients who develop lung infections need to seek timely medical attention and be given proper anti-infection treatment.