Health Effects of Laughter — Science-Proven Power of Laughing
Immune boost, pain reduction, stress relief — is laughter the best medicine?
That laughter is healthy is an old belief, but modern medicine substantially supports it.
Immune Boost
Japanese researcher Itami's team found NK cell activity significantly increased after 3 hours of watching manzai (comic dialogue).
Pain Reduction
Laughter triggers endorphin release — a neurotransmitter with morphine-like pain relief. Oxford study: comedy viewers' pain threshold rose 10%+.
Stress Reduction
Laughter lowers cortisol and adrenaline while raising serotonin.
Cardiovascular
University of Maryland: comedy viewers' blood vessels expanded 22%, stress film viewers' contracted 35%.
Caution
"Cure cancer with laughter" claims lack sufficient evidence. Laughter is complementary therapy, not a replacement for conventional medicine.
Key Points
NK cell activation — immune boost (3-hour manzai viewing experiment)
Endorphin release → pain threshold up 10%+ (Oxford study)
Cortisol (stress hormone) down + serotonin (happiness hormone) up
Blood vessels 22% dilation (comedy) vs 35% constriction (stress film)
Caution: laughter = complementary therapy, not medicine replacement