Emerson Hospital will give a free seminar on back and neck pain at 6 p.m. May 14 at the Westford Regency, 219 Littleton Road, Westford.Attendees will explore the latest treatment options with neurosurgeon Robert Whitmore, M.D., and Terrie Enis, physical therapist and director of Emerson’s Center for Rehabilitative and Sports Therapies.