Thick sputum when waking up in the morning, sputum like jelly, indicating that the sputum is relatively thick, suggesting that the respiratory system has a more obvious bacterial infection. Generally, in such cases, chest X-ray or lung CT is needed, and if necessary, pus sputum is taken for bacterial culture and drug sensitivity test to clarify the etiology. The most common is purulent bacterial infection, such as Staphylococcus aureus, Klebsiella and so on. Generally due to the decline of resistance, purulent bacteria invade into the respiratory tract, so that the mucous membrane of the lungs and bronchial tubes have obvious congestion, edema and a large amount of exudation of inflammatory secretions. It contains a large number of corpses and viable bodies of purulent bacteria, as well as a large number of cells of inflammatory secretions. Clinically, antibiotic treatment is usually chosen, such as penicillin, amoxicillin, clindamycin, cefuroxime.