When patients have symptoms of blood on the walls of the throat, the reasons are as follows: 1. There are often acute and chronic inflammatory factors affecting the throat. Patients may show dilated blood vessels in the submucosa of the throat, or there may be local mucosal rupture and a small amount of blood oozing, resulting in symptoms of blood on the mucosal surface, and patients may further show repeated blood in the sputum. 2. Some patients may have acute or chronic inflammatory factors in the nasal cavity, sinuses and nasopharynx, as well as various benign and malignant proliferative factors, resulting in nasal The presence of bloody secretions that repeatedly flow backwards into the throat may also lead to the occurrence of symptoms of blood on the throat wall. If necessary, further electronic rhinolaryngoscopy is needed for a careful and comprehensive view.