gums when you brush your teeth may be a sign of gum disease or a sign of something more global like a bleeding disorder. In most people, bleeding gums happen when we brush too hard. This does not seem to be the case since you have had similar problems with different tooth brushes. You may have gum disease such as gingivitis (also known as inflammation of the gums). Another possibility is that you have a problem with your blood clotting. Problems with blood clotting can be due to a genetic issue such as hemophilia, a deficiency and vitamin K, or a decrease in the number of blood platelets. There are other, more rare causes such as leukemia, but often present with other symptoms other than gum bleeding.
I suggest that you schedule an appointment initially with a dentist
. You can have your teeth and gums examined and cleaned. If you have gum disease such as gingivitis, then this may be the cause of your bleeding. If you do not have any gum disease, then you should schedule an appointment with your primary care physician
. He or she can order various blood tests which can look for reasons why are are susceptible to bleeding. This will include looking at your coagulation tests and looking at you platelet levels.