Compared to high heels, they don't look remotely hazardous. But flip-flop wearers would do well to think twice before slipping on a pair.
The NHS spends £40million a year treating injuries caused by wearing the casual footwear.
More than 200,000 people visit their GP or even end up in hospital every year after suffering falls or developing long-term problems.
Once worn only at the beach, flip-flops have become the regular summer footwear of choice for many, with one in five women owning at least one pair.
But experts are warning of the dangers of prolonged use, such as the risk of shin splints and joint pains.
They say flip-flops force people to change the way they walk so that when taking a stride they put pressure on the outside of their foot, rather than their heel, causing long-term damage.
And there is also the risk of serious injury from tripping over.
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