The dentist can diagnose the cause of bleeding gums by visually examining the oral cavity. Visual signs such as receding gum lines, swollen gums, light bleeding from dental equipment, and cavities can help dentists easily diagnose the causes of bleeding gums. However, if your dentist notices your teeth are in good health, they will most likely recommend blood tests to help determine what could be the cause. The dentist may also ask you questions about your medical history to help identify causes. Rather, they may refer you to a general practitioner or another specialist physician to help you get an accurate diagnosis.