In general, when hard textured foods are ingested, such as fried chicken, potato chips, or hard food residues such as fish spines and bones, it can cause gum damage, which in turn can lead to gum pain. Large intake of hot fruits and vegetables such as chili peppers, sweet potatoes, cinnamon, lychees, and other hot fruits and vegetables, as well as fire caused by staying up late and emotional situations, and the appearance of gum ulcers, can also cause gum swelling and pain. In addition, the following diseases are often accompanied by the symptoms of gum pain: 1, caries: that is, dental caries, worm teeth, is due to poor oral hygiene, food residues, oral secretions and other decay deterioration, acid production, so that bacteria multiply, causing plaque erosion of the tooth surface formed a cavity. Caries continues to develop, the cavity area expands to the gum or dentin deep layer, and the plaque invades the gum, which can cause gum pain; 2.Gingivitis: it is the non-specific inflammation caused by the plaque invading the gum, also can be caused by the inflammation of interdental papilla, the patient can show as the swelling and pain of the gingival margin, unable to fit with the teeth, and at the same time bleeding when brushing or biting hard objects, the overflow of gingival sulcus fluid increases, which can be purulent; 3.Periodontitis: it is related to Plaque and calculus are closely related, and gingivitis can also be transformed into periodontitis by continuous development. At this time, the gums are red, swollen, painful, can be accompanied by bleeding, pus, heavy cases can also appear periodontal abscess, aggravating gum pain; 4, acute gingival papillitis: often associated with food embedding, excessive flossing, plaque damage and other factors, manifested as gingival papillae congestion, swelling, and spontaneous swelling and tenderness, can spread to the periodontal membrane below the gingival papillae, resulting in inflammation and edema; 5, other conditions: such as female pregnancy, menstruation endocrine disorders during pregnancy, menstruation, and blood diseases such as hemophilia and pernicious anemia may cause painful gum bleeding, and patients are advised to further examine and clarify the cause.