There are several reasons for the redness of the gums: 1) the consumption of hard foods, such as nuts; 2) excessive brushing force or improper use of toothbrushes with bristles that are too hard, resulting in trauma to the gums; 3) the lack of oral hygiene and brushing in the morning and evening, resulting in a large amount of calculus in the mouth, which stimulates the gums and causes redness and swelling of the gums; 4) gingivitis or periodontitis and other diseases, resulting in redness and swelling of the gums; 5) the presence of undesirable restorations in the mouth, resulting in redness and swelling of the gums; 6) the presence of certain hematological diseases, resulting in redness and swelling of the gums; and 7) the presence of a bloodstream disease. 4, gingivitis or periodontitis and other diseases, resulting in red gums. 5, there are bad restorations in the mouth to stimulate the gums, causing redness and swelling of the gums. 6, may be related to certain blood diseases, such as leukemia. The appearance of red gums, it is recommended to go to the hospital mouth situation as soon as possible for a comprehensive examination, only to find the cause of the disease, to be able to treat the symptoms.