Laughter can trigger asthma

If you suffer from this lung disease, maybe it is safest to keep a stiff upper lip.

A study says that laughter triggers asthma in 39 per cent of Australians.

A previous study in 2005 also says that laughter is no medicine for asthma patients.

For more about the disease, check out this page.

But if you don't have asthma, then laughter can be a good thing.