Why are my gums bleeding? - Smile Exchange
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Bleeding gums can be caused by a variety of different things, from using a different type of toothbrush or different flossing routine to more serious conditions like gingivitis or periodontal disease.
Sometimes, just using a new toothbrush or having a new flossing routine is enough to irritate the gums. If you have recently switched from a soft bristle to hard bristle toothbrush, you may want to consider switching back to a soft bristle. In addition, if you’ve just started flossing more frequently, just give it a little time for your gums to get used to it. The bleeding should clear up after several days.
Another cause of bleeding gums could be the medication your taking. If you’re taking blood thinners, which decreases the ability of your blood to clot, you may notice your gums bleeding more easily.
More serious causes of bleeding gums are gum disease such as gingivitis. Gingivitis is caused by a buildup of plaque along the gum line that you don’t remove from normal brushing and flossing. Symptoms of gingivitis include swollen, tender and bleeding gums.
By increasing the quality of your brushing and flossing routine, and making sure you see your hygienist regularly for cleanings, you can reduce the occurrence of gingivitis and bleeding gums.

Source: https://www.colgate.com/en-us/oral-health/conditions/gum-disease/5-causes-of-bleeding-gums-you-should-know-0613