Gum swelling and mouth ulcers caused by the following main reasons: First, the body on fire caused by the common in the stomach fire and liver fire people, stomach fire is mostly due to the preference to eat greasy, sweet and thick such indigestible food, each meal eaten too much, after the meal and did not do the right amount of exercise, will lead to long-term food accumulation caused by stomach fire, stomach fire up to the mouth will make the gums red and swollen, mouth ulcers. Second, poor oral local hygiene caused by the gum redness is often suffering from gingivitis and periodontitis. Mostly because the patient did not brush and rinse carefully, so that the gums around the accumulation of a large number of bacteria, tartar, thus inducing inflammation of the gums and periodontal, resulting in red and swollen gums, if the number of bacteria in the mouth is too much, there will also be the problem of oral ulcers. Third, vitamin and trace element deficiency caused by, especially when the lack of B vitamins, vitamin C and trace elements of iron and zinc, are very easy to induce gum and oral mucosa diseases. For example, it makes the gums become red and swollen and bleed easily, and the mouth ulcers recur.