Fake It ‘Til You Make It
Your brain gets feedback from your face—so if you force yourself to smile, you may actually feel better. There’s lots of research showing that smiling (even fake smiling) actually causes a happier mood.
Anxiety and worry causes lots of frowning which creates tension in the face, neck and jaw. Smiling lightens things up as it takes less muscles to smile than to frown, plus smiling uses different muscles which reduces tension.