The air ambulance has been called to a serious crash involving two vehicles off the A14 in Stowupland.
Police, firefighters and ambulance service was called to the crash in Church Road at about 11.10am today.
A Suffolk police spokesman said: "One driver has suffered potentially serious leg injuries.
"Fire crews have been called to help with the extraction of one person from their vehicle.
"The air ambulance has been called and a full road closure is currently in place."
The driver was taken to West Suffolk Hospital in Bury St Edmunds, a police spokesman later confirmed.
The other driver has been injured but the extent of their injuries are not known.
A Suffolk Fire and Rescue Service spokeswoman said crews are on scene and assisting with the removal of one person from their vehicle.
An East of England Ambulance Service spokeswoman said: "We sent two ambulances, an ambulance officer and East Anglian Air Ambulance.
"One person was taken to West Suffolk Hospital by land ambulance for further care."
In a post on Facebook, Stowmarket police said: "We are currently at the scene of a collision in Church Road, Stowupland.
"The road may be closed for a while, and we are sending vehicles onto Thorney Green to bypass it, and the schools will need to be accessed from the other end."
For up-to-date information about the county's roads, visit our LIVE Suffolk traffic map.
Join our Suffolk Travel Information group on Facebook for all the latest traffic news in Suffolk.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here