Laughter directly affects one’s physiology. Laughter causes various muscle contractions which, in turn, affect body systems. Specifically, the cardiovascular, immune, and respiratory systems are impacted by laughter. Stress levels and pain tolerance thresholds are also directly impacted by laughter. Research has been done on the effects of laughter in patients with cancer, dementia, and atopic dermatitis. Based on the review of multiple experiments, a direct correlation between laughter and multiple body systems and diseases seems to exist.
Dalezman, A. (2012). Is Laughter the Best Medicine? An Evaluation of the Physiological Effects of Laughter. The Science Journal of the Lander College of Arts and Sciences, 6 (1). Retrieved from https://touroscholar.touro.edu/cgi/viewcontent.cgi?article=1112&context=sjlcas