The A134 is closed at Ingham after a pig transporter lorry overturned.
Suffolk Police say they were called at about 7.55am to a lorry on its side partially blocking the road.
Its driver was briefly trapped in the cab. East of England Ambulance Service sent two rapid response vehicles and an ambulance crew and the male driver was taken to West Suffolk Hospital with minor injuries.
A vet was called to the scene but police say a number of pigs have died.
The surviving pigs have been transferred to other transport but the road is likely to remain closed between Rymer Point and the Timworth Green turn-off until about 2pm while the lorry is recovered.