Veronica Stewart says her son 33-year-old Casey Dean Foley went missing February 1, 2011.
Authorities say Casey Foley left his house at 3073 Murphy Lake Rd. in Millington and walked into the woods.
Foley is described at 6' tall, 180 lbs, with brown hair.
He was wearing a tan Carhartt coat, purple jogging pants, and dress shoes.
Foley was last seen Tuesday at 9am. He was possibly heading to the Flint area.
Authorities say the missing person has psychological issues and will run out of his medications Wednesday.
He was recently released from the Caro Center.
Anyone with information is asked to contact the Tuscola County Central Dispatch at 1-989-673-8738.