23-year-old Joshua was reported missing by a family member on Sunday 22 May 2011.
Inspector Phil Cain, of the York Safer Neighbourhood Team, said: “I am concerned for Joshua’s welfare as he has not been in contact with family members since he went missing on Tuesday 10 May and it is not thought that he has essential medication with him.
“I urge Joshua, or anyone who has seen him, to contact me immediately so that I can confirm he is safe and well.
“If you see this appeal Joshua, I would like to reassure you that you are not wanted in connection with any incidents. My sole purpose for asking you to contact me is that I am concerned for your welfare.”
Joshua, or anyone who can help to locate him, is asked to contact Inspector Phil Cain at York Police Station on 0845 60 60 24 7 quoting reference number 12110083331.