Gum disease is caused by a build-up of plaque on the teeth. Plaque forms when you eat and drink and contains bacteria .Untreated plaque will build up and irritate the gums
, leading to redness, swelling and soreness. The type of treatment will depend on the extent of the gum disease. Treatment of periodontal disease can be either non-surgical or surgical therapy. See a dentist and get examined. I sincerely hope it helps.
Best wishes and regards!