Coughing after rib fracture is mostly due to the increase of respiratory secretions which can not be discharged in time and effectively, stimulating the nerve endings of trachea or bronchial mucosa to cause coughing reflex, or coughing caused by secondary lung infection. 1. Rib fracture may cause lung injury, inflammatory exudate increase, after the increase of exudate, the human body will be through the cough this protective reflex will be discharged, manifested in the stimulation of the trachea caused by the symptom of wanting to cough. 2. After rib fracture, patients are reluctant to take deep breaths or cough effectively because of the fear of pain, which may induce infection, manifested as coughing and sputum. Rib fracture patients, it is recommended to go to the hospital in a timely manner, active treatment, to avoid sputum can not be discharged in time, induced lung infection, etc., aggravate the condition.