Key Takeaways
Laughter changes a few short-term measures. The clinical claims get thin quickly.
- Small experiments and a meta-analysis report short-term changes in stress ratings, cortisol, and some immune measures after laughter. These studies do not show that laughter treats disease or produces lasting clinical benefit. [1]
- The social-laughter experiments found changes in pain tolerance and interpreted them as consistent with endorphin activity. The researchers did not directly measure endorphin release, so the mechanism remains an inference. [2]
- A meta-analysis linked self-enhancing and affiliative humor with better mental-health measures and self-defeating humor with worse measures. The included studies were mainly correlational and cannot show that a humor style caused the difference. [3]
- A daily or weekly laughter target can be presented as a personal practice, not a validated medical dose. Humor depends on context and audience, and it should not replace assessment or treatment for a health problem. [4]
Common questions
Does laughter lower cortisol or improve immune function?
Small experiments and a meta-analysis report short-term changes in cortisol, stress ratings and some immune measures after laughter. They did not show that laughter treats disease or produces lasting clinical benefit. [1]
Does laughter release endorphins and increase pain tolerance?
Social-laughter experiments recorded higher pain tolerance and interpreted it as consistent with endorphin activity. The researchers did not measure endorphins directly. The mechanism remains an inference. [2]
Is dark or self-deprecating humor bad for mental health?
A meta-analysis linked affiliative and self-enhancing humor with better mental-health scores. Self-defeating humor tracked with worse scores. Most included studies were correlational, so humor style may be a marker as much as a cause. [3]
How much laughter do I need for a meaningful health benefit?
There is no validated number. Daily laughter can be a personal practice, and a weekly target can remind you to make room for it. Neither is a treatment dose. [4]
Can laughter replace treatment for stress, depression, or chronic pain?
No. The studies measure short-term stress, pain tolerance, or mental-health associations. They do not show that laughter treats depression, chronic pain, or a stress disorder. Laughter can stay part of the day while evidence-based care addresses the condition. [1] [2] [3]
References
- Kramer, C. K., & Leitao, C. B. (2023). Laughter as medicine: A systematic review and meta-analysis of interventional studies evaluating the impact of spontaneous laughter on cortisol levels. PLOS ONE, 18(5), e0286260. https://doi.org/10.1371/journal.pone.0286260
- Dunbar, R. I. M., Baron, R., Frangou, A., et al. (2012). Social laughter is correlated with an elevated pain threshold. Proceedings of the Royal Society B: Biological Sciences, 279(1731), 1161–1167. https://doi.org/10.1098/rspb.2011.1373
- Schneider, M., Voracek, M., & Tran, U. S. (2018). ‘A joke a day keeps the doctor away?’ Meta-analytical evidence of differential associations of habitual humor styles with mental health. Scandinavian Journal of Psychology, 59(3), 289–300. https://doi.org/10.1111/sjop.12432
- Bennett, M. P., Zeller, J. M., Rosenberg, L., & McCann, J. (2003). The effect of mirthful laughter on stress and natural killer cell activity. Alternative Therapies in Health and Medicine, 9(2), 38–45. https://pubmed.ncbi.nlm.nih.gov/12652882/
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