Home > Mental health > News Updated 13 December 2013 Laughter can be dangerous to some people Laughter may not be the best medicine after all and can even be harmful to some patients. 0 iStock Related Laughing yoga cultivates merry mindfulness Teaching the brain to process laughter Animals on a trampoline Ask CyberShrink » Talk Heart to heart forum » 13 hidden signs of stress Regenerative medicine: replacing brain cells lost from stroke Researchers from Birmingham and Oxford, in the UK, reviewed the reported benefits and harms of laughter. They used data published between 1946 and 2013. They concluded that laughter is a serious matter.They identified benefits from laughter; harms from laughter; and conditions causing pathological laughter.Some conditions benefit from 'unintentional' (Duchenne) laughter. Laughter can increase pain thresholds although hospital clowns had no impact on distress in children undergoing minor surgery (even though they were in stitches). Laughter reduces arterial wall stiffness, which the researchers suggest may relieve tension. And it lowered the risk of heart attack, so "reading the Christmas BMJ could add years to your life".Clowns improved lung function in patients with COPD and 'genuine laughter' for a whole day could burn 2000 calories and lower the blood sugar in diabetics. Laughter also enhanced fertility: 36% of would-be mothers who were entertained by a clown after IVF and embryo transfer became pregnant compared with 20% in the control group.Adverse effects of laughterHowever, laughter can also have adverse effects. One woman with racing heart syndrome collapsed and died after a period of intense laughter and laughing 'fit to burst' was found to cause possible heart rupture or a torn gullet. A quick intake of breath during laughing can cause inhalation of foreign bodies and can provoke an asthma attack. Laughing like a drain can cause incontinence. And hernias can occur after laughing: rapture causing rupture.The authors' list conditions that cause pathological laughter and this may help in diagnosis. Epileptic seizures ("gelastic seizures") are the most common cause.The researchers say that their review challenges the view that laughter can only be beneficial but do add that humour in any form carries a "low risk of harm and may be beneficial". They conclude that it remains to be seen whether "sick jokes make you ill, dry wit causes dehydration or jokes in bad taste [cause] dysgeusia (distortion of sense of taste)". EurekAlert More in Mental health China, India face huge mental health burden More: Mental healthNews advertisement Read Health24’s Comments Policy Comment on this story 0 comments Comments have been closed for this article. Logout Comment 0 characters remaining Share on Facebook Loading comments... Other news Medical Itching down there? 8 facts you should know about pubic lice Lifestyle Why growing up in South Africa is so hard News Mpumalanga woman forced to give birth in hospital toilet Medical No ARVs for HIV patients in Limpopo protest area Medical 10 facts you should know about Zika Medical Antibodies found that 'neutralise' the Zika virus From our sponsors World Continence Week: Improve your bottom line Win a Controlice® hamper worth R800 Is erectile dysfunction a taboo topic in relationships? R500 SPAR vouchers up for grabs! Live healthier True or False? » How to eradicate 'earworms' Hearing aids may keep seniors' minds sharp Is ‘selective hearing’ actually a thing? Why can your partner never hear the phone ringing? It could be that their brains are wired to ignore some sounds. Swollen ankles? » Gout - from Natural Standard Your ankles Is your ankle starting to rankle? 13 reasons why your ankles are swollen Are your feet or ankles feeling swollen, heavy and bloated? Here are some causes to look out for.