A driver veered off Rimrock Road and 62nd Sunday into a field at high-speed Sunday afternoon in Billings.
Emergency teams worked feverishly to remove the person from the vehicle and get them into the ambulance.
No other vehicles were involved.
Billings Police tells Billings Beat that drugs and alcohol are not suspected and a medical issue including a possible heart attack or stroke may have caused the accident.
The officer does not believe it will be a fatal accident and the person will survive.
The investigation continues. No names have been released.