A paraglider was airlifted to hospital with a serious leg injury after crashing at Picton this afternoon.

It's unclear what caused the 19-year-old UK national to crash at Endeavour Park, but emergency services were called to Waikawa Rd in Picton at midday.

Nelson Marlborough Rescue Helicopter Trust crewman Carl Babe said the teenager was in a lot of pain from a "significant" serious leg injury.

The exact nature of the injury Babe said he couldn't elaborate on.

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"He's had an accident while he's been paragliding, something has gone wrong on his approach. He's come from a reasonable height, at a reasonable speed."

The man was airlifted to Nelson Hospital.

St John Ambulance and police also attended the incident.

A police spokeswoman said the paraglider appeared to be traveling on his own.