Gum cancer is clinically known as gum cancer, and most of the gum cancers do not have obvious precursor manifestations. Gum cancer belongs to one kind of oral malignant tumors without obvious precursors. Early stage patients do not have obvious symptoms, but with the progression of disease, mild pain may appear, and some patients may have decayed, rough or ulcerated gums and accompanied by pain. In the middle and late stages, patients may have obvious bulging or cauliflower-like swelling of gums, and have difficulty in opening mouth, and in serious cases, they may have bleeding gums, odor or loose teeth, which are also accompanied by obvious pain. Gum cancer has no obvious precursor manifestation, when the above discomfort symptoms appear, it is recommended to consult the doctor in time, improve the examination under the guidance of professional doctors, make a clear diagnosis, and treat it positively, so as to avoid delaying the condition.