Bleeding gums are most frequently a result of gum disease arising out of bacterial deposits on the teeth in the form of plaque and calculus
deposits. Once established, toothbrushing alone usually will not succeed in getting rid of them. You need to consult with a dental surgeon
to facilitate a thorough evaluation and necessary treatment. Bleeding gums
could also be a sign of underlying systemic disease, in which case the appropriate treatment would necessarily have to include correction of the underlying systemic problem.
In any case, visit a dental surgeon for an evaluation and necessary treatment. Also, it would be a good idea to inculcate a habit of regular preventive dental assessments at least once a year, if not more frequently.
Hope this helps. Regards.