Waking up in the morning with blood in your mouth may be caused by gingivitis or periodontitis. Due to the large amount of calculus around the gums that irritates the gums, the symptoms of bleeding gums are easily produced. There may also be systemic irritants, such as hypertension or patients with heart disease who have been taking bye aspirin for a long time, which has a blood-boosting effect, and may have blood in the mouth. It may also be caused by clot dislodgement from tooth extraction. It is recommended to go to the stomatology department for specific examination, and if the blood can be stopped and the examination is later caused by dental calculus, dental scaling can be performed. If the clot is caused by a dislodged clot, it is recommended to stop the bleeding. If it is caused by clotting problem, it is recommended to go to the hematology department for timely consultation and choose whether to stop the medication under the guidance of cardiologist.