Most of the bleeding from brushing is due to gingivitis or periodontitis, but it can also be caused by blood clotting disorders. The common cause of bleeding is gingivitis or periodontitis. After eating, food debris or soft tartar accumulates around the teeth, stimulating the gums to produce inflammation, and the gum tissue is in a state of congestion, and bleeding from eating or brushing occurs over time, which is a typical symptom of gingivitis or periodontitis. In this case, dental cleaning is required, with ultrasonic shock to remove tartar or irritants, followed by rinsing and medication to improve the situation. Bleeding from brushing may also be caused by systemic factors, such as hemophilia or leukemia, and bleeding gums due to blood clotting disorders, which require routine blood tests to identify the cause and treat the problem. Bleeding from tooth brushing may also be caused by hormonal changes during pregnancy. Bleeding from tooth brushing occurs in mid-pregnancy due to changes in hormone levels in the body, and usually improves when the pregnancy period is over. Or perform a light salt water rinse and be careful not to use medications that have an effect on the fetus. So bleeding from tooth brushing may be caused by gingivitis, or leukemia as well as hemophilia, and some of them are related to pregnancy.