A man was taken to West Suffolk Hospital, in Bury St Edmunds, last night after being attacked by a swarm of wasps.
The attack happened at around 7.40pm, in Thetford Forest.
The man, who is believed to be in his 20s, was treated at the scene by staff from the East of England Ambulance Service NHS Trust and the East Anglian Air Ambulance team.
A land ambulance took him to hospital for further care.
It is not known how many times he was stung.