Cricketer-turned-politician Imran Khan was injured on his head when he fell off a forklift that was hoisting him on to a stage for an election campaign meeting in Lahore on Tuesday.
Khan, 60, and several of his bodyguards apparently lost their balance and fell several feet to the ground in this eastern Pakistani city.
Footage on television showed a dazed Khan, blood streaming from a wound on his head, being carried to a vehicle by several of his supporters.
The supporters bundled Khan into the vehicle and drove him to Shaukat Khanum Hospital.
The extent of his injuries could not immediately be ascertained.
Former cricketer Abdul Qadir, who was present at the venue of the campaign meeting, said he had been told Khan had sustained injuries to the front and back of the head. He said the persons on the forklift had lost their balance when someone tried to climb on it from below.
Leaders of Khan's Pakistan Tehrik-e-Insaf party announced from the stage that he would return to address the meeting after being treated for his injuries.