Gum bleeding can be a sign of more serious dental problems, such as gingivitis, or may be caused by infection, vitamin deficiency, leukemia, blood-thinning medication, hormonal imbalance or ill-fitting dentures. Assuming the cause is dental, bleeding gums can be eliminated or at least kept under control with proper care.

Long standing inflammation of gums: Poor maintenance of the teeth, such as inadequate brushing or failure to rinse the mouth after meals results in a thin layer of food and bacteria covering the tooth surface. This bacterium is the chief culprit behind the inflammation. The gums during the stage of infection become soft, spongy and swollen.

There are also other reasons for Gum bleeding

Trauma to the gums by hard brushing or tooth picking with sharp objects result in bleeding gums.

Bleeding can also be due to injury of the gums by any sharp food item e.g., fish bone.

Hot food and chemicals can end up burning the gums, further resulting in bleeding.
Deficiency of vitamin C and vitamin K can cause bleeding in the gums.

Failure in blood clotting mechanism.

Bleeding of the gums may occur with or without associated pain. The pain if present is usually dull in nature.

Bleeding is usually noticed during brushing, or in the saliva, while spitting.

Eating of any coarse food items may induce bleeding.

Diabetes type II

When blood glucose is not controlled they respond differently to oral bacteria Compared to controlled glucose level  and normal individuals.
So they :
1- have more harmful proteins (cytokines) in their gingival tissue, causing destructive inflammation of the gums.

2-(growth factors) are reduced, interfering with the healing response to infection. Diabetics tend to lose collagen, a protein that supports gums, skin, tendon cartilage, and bone, in their gum tissue thus hastening periodontal destruction.

3-Vascular disorders, like reduced circulation in tiny blood vessels in the gums (caused by diabetes) interfere with nutrition and healing in the gum tissues.

type 1 diabetes, especially those with poor control, are very vulnerable to early-onset periodontal disease as they reach puberty.

Treatment
1.Good blood glucose control : by following up with GP
watching the diet and exercising

2.Oral hygiene:
" keep it clean"
3.Watch for warning signs.Like bleeding while brushing
Painless spots
If your teeth is getting longer
And visit your dentist regularly  for check ups


  i hope that answers your Q

with regards