Smiling can be considered a natural antidepressant because it releases chemicals in the brain that can improve mood and reduce stress:
Endorphins: Act as a mild pain reliever
Serotonin: An antidepressant that can reduce stress
Dopamine: Increases feelings of happiness
Neuropeptides: Help fight off stress
Smiling can also have other health benefits, including:
Boosting your immune system
Increasing energy
Helping you live longer
Improving your focus and self-esteem
Making you appear more approachable and trustworthy
Improving your relationships
Even forcing a smile can improve your mood and happiness level. However, if you're suffering from depression or anxiety, you should talk to your physician immediately.