The 33-year-old Kyran Shervington, who has not been seen since he left the hospital where he had been staying in Burgess Hill, West Sussex, on Wednesday 14 October.
Kyran is described as black, 5’10”, of heavy build, with shaved head and full black beard. He was last seen wearing a red and white jumper, red tracksuit bottoms and white trainers.
Police believe he boarded a train from Burgess Hill on 14 October and may be heading to Birmingham.
There is concern for Kyran’s welfare and police ask anyone who sees him or knows of his whereabouts not to approach him but to contact the police via 101, quoting serial 545 of 14/10 (for Sussex) or serial 3890 of 14/10 (for West Midlands).