UPDATE 8:20am: A FOURTH person has been injured on Fraser Island since Sunday afternoon.
The RACQ CareFlight Rescue helicopter flew to the aid of a British tourist who fell at a campsite north of Happy valley about 2am on Monday.
A CareFlight spokesperson said the woman suffered a head injury and was flown to Nambour General Hospital in a stable condition.
EARLIER: THREE men, including a 14-year-old boy, were injured in separate incidents on Fraser Island on Sunday and airlifted in a matter of four hours.
The RACQ CareFlight Rescue Helicopter was first tasked to the island at about 4:30pm on Sunday after a motorbike crash near Hook Point.
A CareFlight spokesperson said a 23-year-old man had a serious leg injury after he lost control of his bike and hit a sand dune.
An intensive care flight paramedic treated the man before he was flown to Hervey Bay Hospital in a stable condition.
The helicopter crew was immediately called back to the island after a 14-year-old boy dislocated his shoulder in an incident at Orchid Beach.
He was flown south to Happy Valley, where he was treated by Fraser Island paramedics.
At Happy Valley, the helicopter crew also came to the help of a 26-year-old man who had severely injured his hand in a vehicle winching device.
The man was flown to Hervey Bay Hospital about 8:30pm in a stable condition.