Starting with Charles Darwin, scientists have observed that smiling is not only a positive response mechanism, but can also induce positive emotions in and of itself.
Studies indicate that self-conscious people are best at channeling their smile into positivity, but that there is a robust effect across numerous studies that were conducted on this subject! Not only do studies indicate that a smile is translated into positive feelings, but other associated autonomic responses may also occur.
So next time you’re stressed, or feeling down, summon some energy to lift the corners of your mouth upward and smile! At the very least a genuine smile will put others at ease and hopefully help you find some space to work through your problems.