Illinois State Police said 13-year-old Jacob Pasechnik, who disappeared in Wilmette, has a condition that puts him in danger.
Pasechnik was last seen at 14th Street and Wilmette Avenue around 3:15 p.m., police said. He was wearing a dark blue sweatshirt, a yellow shirt and black pants.
Wednesday morning, Wilmette police said Jacob was found safe and well in Chicago.
Pasechnik, who has brown hair and brown eyes, is 5-foot-5 and weighs about 120 pounds.