Are swollen gums caused by stress?

Possibly: Stress alone is not usually enough. Poor dental hygiene or an infection should be ruled out.

No: Stress alone doesn't cause swollen gums. It is the build-up of plaque and tarter that sets the stage. Stress does contribute to how your body deals with this accumulation. If you are stressed, your body may secrete more cortisol, a substance that helps promote bleeding gums and inflammation, which will cause more swelling.