Bleeding gums when you brush or floss is often an early symptom of gingivitis, which can lead to advanced stages of gum disease.
Bleeding gums can also be caused by bleeding disorders,
vitamin K deficiency, hormonal changes, scurvy or the use of blood thinners.
As I see in the image, you have too much of deposits and stains in the teeth which needs professional cleaning.
Next Steps
Visit dentist. Do not ignore the situation.
Health Tips
Hard brushing can further damage the soft tissues of your mouth. Floss at least once a day and be sure to floss beyond the gum line to remove more plaque. Control bleeding by applying pressure to the area with a cold compress.