The A&E challenge explained in 60 seconds
4 June 2013 Last updated at 00:13 BST
Pressure has been building on A&E units in recent years.
Last winter the NHS missed its four-hour waiting time target - and many people are worried hospitals will struggle this time round.
But how have these problems come about - and what is the NHS going to do about it?
Nick Triggle runs through the issues in just one minute.