Police are appealing for help in finding Steven Preen, who is is about 5ft 6ins tall, with grey hair.
Officers say that he has links to Worcester.
Walsall Police tweeted: "#MISSING | We need your help to trace Steven Preen who has gone missing from #Walsall. The 47-year-old hasn't got his diabetes medication with him and we're concerned for his health and well-being.
"We appreciate this isn't the clearest photograph but Steven is around 5ft 6ins tall with grey hair. He has links to #Worcester and anyone with information can contact us via live chat or by calling 101."