Bleeding gums are caused by vitamin C deficiency, which will manifest as general fatigue in the early stage, and if further deficiency will lead to painful or inflamed gums, which will show spontaneous bleeding or bleeding performance when brushing teeth. Some patients will also have symptoms of petechiae and petechiae on the skin mucosa, which can be improved by taking oral vitamin C tablets, or by eating more vitamin C-rich foods such as oranges, kiwis, and spinach. Clinically, bleeding gums caused by simple lack of vitamin C is relatively rare. Most of them are caused by gingivitis, periodontitis, and stimulation by eating spicy food, which can be seen by the dentist. If it is gingivitis, you can take oral metronidazole treatment, usually pay attention to a light diet, rinse your mouth after meals, if it is caused by periodontitis, you can do ultrasonic cleaning to remove calculus, usually brush your teeth with a soft-bristled toothbrush to reduce the stimulation of the gums.