A lot of bleeding in the mouth at night in bed, it is necessary to go to the emergency department of a general hospital to check the exact cause of the bleeding and to make a differential diagnosis of the disease. Clinically common oral bleeding, for dentistry is gum bleeding, the most common is also gingivitis, gingivitis has typical oral bleeding symptoms, slightly mild gingivitis is bleeding under stimulation, including bleeding from brushing teeth and biting hard objects bleeding. However, correspondingly heavy gingivitis will have spontaneous bleeding symptoms, even at night without special treatment. It is also important to check the patient’s general condition and to check for blood tests to see if there are any blood system disorders, hypertension or oral anticoagulants.