Hampshire and Isle of Wight Constabulary said the helicopter had come down in a field near Ventnor.
A critical care team, including a doctor and specialist paramedic, was dispatched by the Hampshire and Isle of Wight Air Ambulance.
A spokesperson for the air ambulance service said it had treated and airlifted one patient to a hospital.
It was not immediately clear how many people were on board or whether there were any other injuries.
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