Police are appealing for anyone who might have seen or heard from missing man Karl Hawkins in the Lincoln area.
The 43-year-old man from the Southey Green area of Sheffield was last seen leaving his home at around 9am on Sunday, June 19.
Officers said they have received information that Karl could be in Lincoln.
Karl has not been seen or heard from since Sunday and officers are growing increasingly concerned for his well-being.
He has a medical condition that requires treatment.
Karl is described as white, around 5ft 9ins, of skinny build with short grey hair and a brown beard. It is not clear what he is wearing.
If you have any information contact Lincolnshire Police on the 101 number quoting incident 300 of June 21.