Son of Addison Fitch and Susan Stoughton
Frederick was a physician. He studied medicine with Loren G. Whiting, M.D. of his native place, and graduated from the Bellevue (New York) Hospital Medical college in 1865.
During Frederick's medical studies, he served as a hospital steward with the 16th Regiment, Vermont Infantry from October 23, 1862 through August 10, 1863. The 16th Regiment was commanded by his cousin, E H Stoughton. In July 1964, Frederick was appointed as Medical Cadet, and on May 3, 1865 he was commissioned as Acting Assistant Surgeon, serving in Mobile, Alabama for several months. In January 1866, he settled in Meridan, Connecticut. While there, he served as alderman and physican to the almshouse.
Frederick married to Mary A Gilson on February 23 1867. About 1868, his health began deteriorating due to malaria. In 1878, he was forced to suspend his practice to focus on his own health. The couple traveled to Colorado, Maine, and other locations to try to find a more hospitable climate. The 1880 US Census indicates couple lived with Frederick's mother in Chester, Vermont. They were living in Meriden at the time of his death.
Frederick's passing was noted with an obituary in The Proceedings of the Connecticut Medical Society, 1880.