BOC Domain 4 Treatment and Rehab – Therapeutic Modalities Practice Test

In multiple sclerosis, heat sensitivity can worsen symptoms temporarily, a phenomenon known as Uhthoff's effect. Heat raises tissue and sometimes core body temperature, which can slow conduction on already compromised nerve fibers and bring on fatigue, weakness, vision changes, or numbness. Because moist heat packs deliver warmth directly and can elevate body temperature, they should be used sparingly or avoided in people with MS. Other modalities like ice packs can help with pain or spasticity without triggering this temperature-related issue, and electrical stimulation (TENS or interferential current) typically doesn't raise temperature and can be used with monitoring for comfort and safety.