There are many signs of gum cancer, such as loose teeth, gum ulcers, swollen and bleeding gums and so on. 1. Loosening of teeth: when the lesion of gum cancer invades the bone tissues around the gums, it will cause the teeth to loosen for unknown reasons. 2. Gum ulcers: ulcers will be formed after the invasion of gingival cancer, and usually the ulcers are difficult to heal, recurring, and even under medication, they are difficult to heal. 3. Swelling and bleeding of gums: Gum cancer can form irregular lumps in gums, and the lumps are easy to break and bleed, so it will cause swelling, pain and bleeding. Gum cancer has many signs and symptoms, and after the occurrence of unexplained discomforts, patients should go to the hospital in time to improve the examination and take standardized treatment according to the doctor’s instruction, so as not to be negligent and careless, so as not to delay the condition.