Several emergency resources battled "deteriorating weather conditions" to rescue a 27-year-old German tourist, who suffered catastrophic injuries after falling off a cliff near a camping site in the Blue Mountains.

The man had been missing for more than 12 hours before being found by police at Perry's Lookdown Campground at 2.15pm on Friday afternoon. He had been camping nearby with friends, and it's believed he got up to go to the toilet when he stumbled off the cliff.

Paramedics tend to a German tourist who fell off a cliff in the Blue Mountains. Credit:NSW Ambulance

Initially, four ambulance crews rushed to the site. The man had broken both his lower legs, was suffering hypothermia and was being treated for spinal and head injuries.

"He has no feeling below the waist," NSW Ambulance Chief Inspector Brian Parsell said, adding that the man's condition was "serious but stable".