Walgreen was born on a farm near
Galesburg, Illinois, before moving to
Dixon, Illinois, in 1887. He was the son of
Swedish immigrants. In the 1790s, Charles's great-great-great-grandfather, Sven Olofsson, adopted the surname
Wahlgren () during his military service, a family fact passed down over the generations. When Charles's father, Carl Magnus Olofsson, came to America from Sweden, he decided to change the family name to
Walgreen. When Charles was still quite young he and his family relocated to
Dixon, Illinois, in 1887. He attended
Dixon High School and Dixon Business College. He was a member of the international fraternity
Tau Kappa Epsilon. As a young adult, he lost part of a finger in an accident at a shoe factory. The doctor who treated him persuaded him to become an apprentice for a local druggist. His interest in pharmacy dated from the time he was employed by D.S. Horton, a druggist in Dixon where he was apprenticed as a pharmacist. In 1893, Walgreen went to Chicago and became a registered pharmacist. At the start of the
Spanish–American War, Walgreen enlisted with the
1st Illinois Volunteer Cavalry. While serving in Cuba, he contracted
malaria and
yellow fever, which continued to plague him for the rest of his life. ==Career==