Heather Brooks, 25, was last seen at her home on Arbor Creek Drive in Roswell on Thursday afternoon.
Brooks' boyfriend said Brooks left her home to visit a friend at North Fulton Hospital just before 5 p.m. Her boyfriend said he received a text from her at 5:30 p.m., but she has not been seen or heard from since.
Brooks suffers from narcolepsy -- a sleeping disorder -- and is on medication. Police said they are concerned about her being out in the cold.
Brooks is 5 feet 4 inches tall and weighs between 125 and 130 pounds. She has red hair and was last seen wearing a dark jacket and blue jeans. Anyone with information should call the Roswell Police Department.