There are many reasons for blood in the saliva in the morning, such as laryngitis, oral diseases, blood system diseases. 1. Pharyngitis: pharyngitis can lead to pharyngeal mucosa congestion, edema, due to the rupture of capillaries in the throat, which may lead to the phenomenon of blood in the saliva in the morning, accompanied by pain in the throat, dryness and other phenomena. 2. Oral diseases: gingivitis, periodontitis and other oral diseases, due to gum tissue congestion, edema, resulting in gum bleeding, which may lead to the phenomenon of blood in the morning saliva. 3. Blood system diseases: leukemia, scurvy and other blood system diseases, will also show spontaneous bleeding of the gums, resulting in blood in the morning saliva, and bleeding, and not easy to stop bleeding. There are many reasons for blood in the morning saliva, it is recommended that patients go to the hospital in time to improve the examination, after a clear diagnosis, follow the doctor’s instructions to take standardized treatment, do not ignore the symptoms, take it lightly.