Sudden onset, sore swollen bleeding gums in entire mouth. no gum disease at all, no meds, no tobacco, no over flossing, what non dental causes?

Get a dental exam: Bleeding gums are often the first sign of gingivitis. Brushing too hard can also cause bleeding. Cigarettes and other tobacco products also may be causative. You need a dental exam as soon as possible.

Gum disease: Sore swollen bleeding gums are sure signs of gum disease. Please see your Dentist. Referral to a Periodontist may be in order. Other causes can be systemic problems such as Diabetes or Blood Dyscrasias. A Periodontist can make the differential diagnosis. Don't ignore this.