Why good laughter is a great medicine for the body
There’s a moment in the middle of a proper, helpless laugh when your whole body gets involved. The shoulders drop, the eyes water, the diaphragm contracts in rapid, involuntary pulses, and breathing briefly becomes impossible.
It feels wonderful. It also, as it turns out, is doing you genuine medical good.
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Laughter is one of the most underrated health interventions available to human beings, and it is completely free.
What actually happens inside your body
When something genuinely funny lands, the response is immediate and full-body.
The diaphragm and surrounding muscles contract rhythmically. This is the physical engine of laughter, responsible for that helpless, breathless, gasping quality when something really gets you.
Simultaneously, the brain releases a burst of endorphins, the same natural pain-relieving chemicals triggered by exercise, which is why laughter can genuinely raise your threshold for discomfort.
The immune system responds too. Research shows that laughter increases the activity of natural killer cells and raises levels of immunoglobulin A, the antibody that guards the mucous membranes of the respiratory tract and gut, your first line of defence against airborne and foodborne pathogens.
Effects on immunoglobulin levels have been recorded lasting up to 12 hours after a single humorous intervention.
Cortisol, the body’s primary stress hormone, suppresses immunity, disrupts sleep, and, when chronically elevated, contributes to obesity, depression, and cardiovascular disease.
A 2023 review and meta-analysis published in PLOS ONE found that “spontaneous laughter is associated with a significant reduction in cortisol levels compared with usual activities, suggesting laughter as a potential adjunctive medical therapy to improve well-being.”
Even a single laughter session produced a cortisol reduction of nearly 37 per cent in the randomised controlled trials reviewed.
The heart, the pain, and the long game
Laughter-inducing activities such as watching a comedy film have been associated with improvements in endothelial function and carotid arterial compliance, with effects lasting up to 24 hours.
The endothelium is the thin inner lining of blood vessels; healthy endothelial function means vessels dilate properly, blood flows more freely, and the risk of clots and arterial stiffness falls.
A laugh, in other words, is a mild cardiovascular workout without the sweat.
Pain tolerance rises too.
Clinical studies have found that people can sustain discomfort for longer after laughing – a finding that has led some palliative care and chronic pain programmes to incorporate humour-based interventions alongside conventional treatment.
What all of this adds up to is a compelling case for treating a genuine sense of humour the way you would treat sleep, hydration, or exercise: as something the body actually needs.
