Police were called to search for a man spotted on a main road in just his underpants.
Officers were called to Preston New Road at around 11.25am today.
The man was seen walking down the carriageway shouting and stripping off.
A police spokesman said he was seen running towards cars.
He was spotted running in the direction of Blackpool, close to the Clifton Arms pub and the junction with Mythop Road.
He has now been found by officers close to the pub and detained.
The man has taken by ambulance to The Harbour in Preston New Road to undergo mental health assessments.