Concerns have been expressed for the welfare of Martin Roberts who has not been seen since leaving Northampton General Hospital this morning (Wednesday).
Mr Roberts, aged 45, was last seen around 6am, leaving the hospital, walking in the direction of Cheyne Walk.
He was last seen wearing a white top with a green sleeveless jacket.
Mr Roberts comes from Daventry but was last seen in Northampton and drives a silver VW Polo.
Anyone with any information can call Northamptonshire Police on 101.