Sore throat with blood in sputum and pus and yellow sputum may be related to bacterial infection of the throat, pharyngeal tumor, bronchitis and other factors. 1. Bacterial infection of the throat: inflammation of the throat can cause redness, swelling, heat and pain in the throat, which is characterized by swelling and pain in the throat. The formation of yellow sputum is because when inflammation occurs in the throat, there will be inflammatory secretion oozing out, the neutrophils in the body to play its defense function, will be cleaved and necrotic, and then the formation of yellow sputum, the local capillary rupture, can appear with blood. 2. Pharyngeal tumor: nasopharyngeal cancer, laryngeal cancer, etc., which may cause sore throat, blood in sputum and yellow pus sputum. 3. Bronchitis: Bronchitis with purulent sputum is mostly caused by Streptococcus pneumoniae infection, and if inflammatory substances ooze out, it may lead to blood in sputum, and acute onset of severe coughing may lead to sore throat. It is recommended that the patient consult a doctor in time to identify the cause of the disease and then correctly treat it.