Early signs of gum disease are bleeding with flossing and brushing. You need to see your dentist. Flossing and brushing INCORRECTLY may be a problem. You may have become careless with home care. Revising your flossing and brushing may be all that you need to stop the bleeding. People can have bleeding puffy gums, with good home care it can be reversible.
You will not have any damage to the supporting tooth structures. Your body may be fighting this.
There may be a time when your body won't be able to fight your gum problem. Your tooth supporting structures will be attacked. You won't feel any pain. We take care of our teeth so we can have them for the rest of our lives.