There are more reasons for the appearance of blood blisters in the mouth, and the root blood blisters need to be analyzed specifically. Blood blisters inside the mouth, may be teeth bite or eat too hot, too hard food, making the oral mucosa damage caused. This blood bubble can be large or small, relatively small blood bubble can be naturally absorbed and healed, no special treatment; but if the blood bubble is larger, foreign body feeling obvious, usually need to use a clean, sterile syringe puncture will be bruised blood extraction. In addition, the presence of blood blisters in the mouth may also be due to vascular malformations or hemangiomas, which can be improved by surgical removal or local sclerotherapy injection. There is also a portion of patients with bleeding disorders that can manifest as blood blisters when there is damage to the mucosa. Therefore, blood blisters in the mouth are usually not considered as cancer. When blood blisters appear inside the patient’s mouth, it is recommended to go to the stomatology department of the hospital in time to provide symptomatic treatment for the cause. In daily life, patients should chew slowly when eating, not to be too hasty, and avoid eating too hot and hard food to avoid damaging the oral mucosa.