Only when there is blood in the spit after waking up from sleep, it may be related to oral injury caused by improper brushing before sleep or grinding of teeth while sleeping. Consider that it may be oral diseases such as gum inflammation, dry oral mucosa, or other systemic lesions that cause damage in the oral cavity, and brushing or grinding aggravates the damage causing spitting up blood after waking up from sleep. However, there is not necessarily an inevitable link between waking up and spitting up blood, gums, oral mucosa and other parts of the capillary rupture bleeding can be mixed in the saliva, gastrointestinal bleeding or systemic blood disorders may also lead to the performance of spitting up blood after waking up: 1, gingival inflammation: patients with gingivitis, periodontitis and other oral diseases, plaque, calculus, etc. in the teeth and gums between the accumulation, mostly after sucking, brushing and other actions Bleeding, such as not doing a good job of oral cleaning or brushing too violent before going to bed, may cause swelling and congestion of the gums, appear after waking up spitting blood, generally such patients accompanied by gum redness, pain and other symptoms; 2, oral mucosa dry: cold and nasal congestion or other causes of sleep for a long time open mouth breathing, may lead to dry oral mucosa, oral activities after waking up, do spitting, coughing and other actions, the pharyngeal mucosa After friction may lead to capillary rupture bleeding, performance after waking up spitting blood; 3, gastrointestinal bleeding: esophageal or gastric mucosal injury and other causes of gastrointestinal bleeding, or nocturnal esophageal reflux, acidic contents may burn the mucosa, after waking up position change, spitting saliva visible part of the dark red blood, such patients can exist abdominal burning sensation, abdominal pain, acid reflux belching, loss of appetite, black stool and other symptoms; 4 Blood disorders: Diseases with abnormal coagulation can lead to spontaneous bleeding, and blood can be discharged together with spitting up after waking up stimulated by internal and external factors, usually accompanied by recurrent gum bleeding, skin bruising, and symptoms such as not easy to stop bleeding after injury. In addition, tumors in the nasopharynx may be accompanied by blood when spitting up after waking up, and patients with tuberculosis may also have symptoms of coughing up blood, but not necessarily only after waking up. If there is only one or two times when there is blood in the spit after waking up, it does not mean that there is an inevitable connection between waking up and spitting up blood, and it is necessary to actively seek medical examination.