Studies have shown that smiling releases endorphins, other natural painkillers, and serotonin. 9 Together, these brain chemicals make us feel good from head to toe. Not only do they elevate your mood, but they also relax your body and reduce physical pain. Smiling is a natural drug.

What are the side effects of smiling?

The researchers found that smiling frequently may actually make people feel worse if they're sort of faking it — grinning even though they feel down. When people force themselves to smile because they hope to feel better or they do it just to hide their negative emotions, this strategy may backfire.

What are the benefits of smiling a lot?