— Update at 6.15pm: Lewis Dickson, 21, missing from Durham has now been found, Lincolnshire Police said.
Durham Police are looking for a missing man from Seaham who could be in Lincoln or Stamford.
Officers are becoming increasingly concerned for the welfare of Lewis Dickson (21).
He was last seen leaving the Rock Fill service station and walking towards Stamford at 5.30am on October 23.
It is believed he has been in Lincoln for a couple of days, before heading to Cambridge. He is known to use trains in order to travel.
Lewis is described as tall and of slim build, with short dark brown hair. He has a scar on his left elbow.
He was last seen wearing a white waterproof jacket with orange markings, dark grey tracksuit bottoms, and light grey Adidas trainers with blue stripes on the side.
Sgt Siobhan Jones said: “We are eager to trace Lewis as soon as possible as he is reliant on specific medication which he does not have with him.
“His behaviour may appear to be awkward and he may be talking to himself.
“His family are very concerned for his welfare. Lewis is known to travel extensively and he is thought to have left Seaham and travelled to Lincolnshire on Tuesday evening. From there, he may have travelled to Cambridge.
“We are keen to speak to anyone who may have seen him.”
Anyone who may know of his whereabouts, or may have sighted him, should call police on 101.