There is blood in the saliva, spit a few times to consider may be bleeding gums, pharyngitis and other causes. 1. Bleeding gums may be the result of localized oral diseases, commonly including gingivitis or periodontitis. Gums bleed easily after mechanical stimulation, such as brushing, food impaction or sucking. Supragingival scaling is usually required, along with localized saline rinsing, followed by application of iodized glycerin or mouth rinsing with compounded borax solution. Attention also needs to be paid to improving oral hygiene by brushing the teeth in the morning and evening and rinsing the mouth after meals. On the other hand, if the bleeding is heavy, it is recommended to go to the hospital in time to check whether it is a bleeding disorder. 2. Laryngitis, bleeding in the throat and trachea, often accompanied by coughing, if the blood is spit out or coughed up through the mouth, seen in more serious laryngitis patients. In addition, it may also be a violent cough, resulting in small blood vessel rupture, and blood in the sputum. Bleeding from these conditions can be mixed with saliva and can disappear with a couple of spits, rather than continuing to bleed and fill the mouth. Since the severity of the condition varies from patient to patient, it is often necessary to combine this with imaging studies before management. In addition, if this condition occurs frequently with symptoms such as coughing or nausea, it is necessary to consider whether it is caused by respiratory bleeding or gastrointestinal bleeding, and should be consulted promptly to avoid delaying the diagnosis and treatment of the disease.