Bleeding gums after quitting smoking should be caused by gingivitis, periodontitis, blood diseases, etc., and there is generally no direct relationship with quitting smoking. 1. Gingivitis: usually caused by the accumulation and stimulation of plaque and calculus, resulting in redness and swelling of the gums, which in turn leads to bleeding gums. Especially patients with a history of smoking, there will be a lot of plaque on the surface of the teeth, and the accumulation of pigment is more likely to cause bacteria to adhere to and stimulate the gums, so that the gums appear to bleed. 2. Periodontitis: If patients do not treat gingivitis in time, the inflammation will spread from bleeding gums to deeper periodontium and alveolar bone, resulting in loss of attachment, resorption of alveolar bone, loose teeth and more serious bleeding gums. 3. Blood diseases: If the gums bleed due to blood diseases, such as leukemia, idiopathic thrombocytopenia, coagulation disorders, etc., blood tests and diagnosis, such as routine blood tests and coagulation, are needed. There are many other reasons why the gums keep bleeding after quitting smoking, and patients are advised to actively seek medical treatment to avoid delaying the condition. This condition is not related to smoking cessation, so you should continue to adhere to smoking cessation.