Dera Ismail KhanFormer chief minister Ali Amin Gandapur has 9 stitches in his neck.
His brother says Punjab police gave him electric shocks in custody before the 2024 elections.
Faisal Amin Gandapur says surgery about 10 days ago treated the old injury and the latest hospital visit was a follow-up.
No one has independently verified the electric-shock claim.
Gandapur is campaigning for the 27 September political call, his brother says.
Sources: Dawn