Gums that bleed when you suck on them are not necessarily cancer. It may be caused by gum cancer, leukemia, etc., or general oral diseases such as gingivitis and periodontitis, as well as hematologic diseases such as anemia and thrombocytopenia. Therefore, it needs to be clarified in combination with other accompanying symptoms as well as auxiliary examinations. If the gums bleed when you suck, accompanied by persistent gum ulcers, loose and painful teeth, or even difficulty in opening the mouth, consider the possibility of gum cancer, which can be confirmed by X-ray examination and pathological biopsy. If the gums bleed when sucking, accompanied by fever, progressive anemia, bleeding tendency or bone and joint pain, consider the possibility of leukemia, which can be confirmed by routine blood tests and bone marrow aspiration. If it is accompanied only by symptoms such as red, swollen, hot and painful gums, gingivitis and periodontitis are considered, and it is recommended to go to the stomatology department of the hospital for consultation. If the gums are relatively clean but bleed when the gums are sucked, consider thrombocytopenia, anemia and other blood disorders, and suggest going to the hospital for routine blood tests. In normal life, pay attention to maintain oral hygiene and eat more foods that are better for your teeth, such as cabbage, celery and winter melon, to prevent oral diseases. Have regular checkups to screen for any other diseases.