There are many reasons for yellow saliva with blood after getting up, and the common ones are pharyngitis, tonsillitis, periodontitis and so on. 1. Pharyngitis: Inflammation of the pharyngeal mucosa, submucosa and lymphatic tissues, resulting in pharyngeal congestion and edema, pharyngeal pain, due to secretions attached to the posterior wall of the pharynx after waking up, in the morning there can be irritating coughing symptoms, accompanied by nausea, dry heaving, saliva can be yellow with blood. 2. Tonsillitis: Infectious disease of tonsils caused by various pathogenic microorganisms, depending on the course of the disease, mainly manifested as fever, pharyngeal discomfort, pharyngeal pain and other symptoms, red, swollen and pus-filled tonsils, and yellowing of saliva with blood in the morning after getting up. 3. Periodontitis: Due to the bacteria in plaque invade the periodontal tissues leading to the destruction of the gums, periodontal membrane, alveolar bone and the formation of periodontal pockets, with the progress of the disease teeth will slowly loosen, the morning after getting up, the saliva can be seen yellow with blood. There may be other reasons such as gastric ulcers, etc. It is recommended to go to the hospital as soon as possible to clarify the cause of the disease, and then carry out targeted treatment under the guidance of the doctor.