There are several possibilities for swelling inside the gums: 1. caused by periodontal diseases, such as calculus under the gums, which stimulates the gums to produce redness and pain, and causes a state of separation between the gums and teeth. Long-term stimulation of the gums, easy to cause food embedding plaque retention, it is easy to appear the phenomenon of gum swelling. Usually choose local rinsing, and do gum scraping, in order to promote the gums back to health. 2, gums inside swelling, may also be caused by the alveolar abscess. This is usually due to inflammation in the root tip of the tooth, which stimulates the gums to produce an abscess. It is usually chosen to do dental root canal treatment with local rinsing or oral anti-inflammatory drugs, which can effectively stimulate the gums to promote their healing, commonly used drugs such as cephalosporin or amoxicillin, etc. 3, swollen inside the gums, may also be due to the phenomenon of gingival tumor. And this gingival tumor if the local is relatively clean, you can choose to do surgical removal treatment.