Police are appealing for help to find Joseph Dullaghan who is missing having left Basildon Hospital.
Dullaghan is 47 and lives in Grays. He left the hospital just before 12.25am on June 9.
He is in a bad state of health and needs to be found.
Dullaghan is described as white, 5ft 8ins tall, of medium build, with scruffy light brown hair. He may be wearing a blue t-shirt and light green trousers.
Anyone with information on his whereabouts is asked to contact police on 101.