Swollen gums but no pain may be caused by gingivitis, jawbone cysts, gingival tumor and other reasons. 1. Gingivitis: poor oral hygiene for a long time, resulting in the formation of tartar on the surface of the teeth and gums, leading to gingivitis, which is mainly manifested as swollen gums, congestion, but no pain. 2. Jaw bone cyst: If there is a jaw bone cyst, there will be a feeling of bulging in the gums, usually slow-growing, will also be manifested as swollen gums without pain. 3. Gingival tumor: if there is a tumor or tumor lesion on the gum tissue, periodontal membrane, jawbone alveolar protruding connective tissue of inflammatory hyperplasia, can also lead to swelling of the gums, most of which will not cause pain. Usual life need to pay attention to oral hygiene, should go to the regular hospital in a timely manner, clear cause, under the guidance of professional doctors to take targeted treatment.