Cough with sputum for more than a week severe loss of appetite may be caused by upper respiratory tract infection, lung infection. Upper respiratory tract infection, that is, caused by colds, due to viral infection, resulting in damage to the mucous membrane of the upper respiratory tract, there is an increase in secretions, that is, increased sputum manifestations, while the spirit of the poorer resulting in loss of appetite, is a more common cause. In addition, if the cough and sputum are more serious, the possibility of lung infection cannot be ruled out. Due to bacterial or viral infections, the trachea and bronchial tubes in the lungs are damaged, leading to coughing and sputum symptoms. At the same time, the infection causes poor physical condition and affects the appetite. Prompt medical attention is needed to treat the primary cause of the disease, and the appetite can be restored.