Police and the family of Stephen Crawford are becoming increasingly concerned for his well being.
He left Craigavon Area Hospital yesterday morning (Tuesday).
Mr Crawford, who police officers say is not from the area, was last seen at the hospital roundabout just after 9am.
He was wearing a grey dressing gown with a hood and no belt and blue trainers.
Police are asking that people check outbuildings and sheds in the area.
“If you work in Kernan/Seagoe/Carn area – please check warehouses and outbuildings. If you were driving in the Kernan area of Portadown – please check your dashcam footage between 9am-10am. If you have any information – please contact us on 101 and quote ref 287 – 17/12/19,” added a police spokesperson.