Several outlets have published reviews and recommendations for the best mattresses for various health conditions, including fibromyalgia, arthritis, and back pain. The recommendations appear to be based on expert reviews and lab testing, with some outlets highlighting specific mattresses for side sleepers or those with sciatica. It is unclear which mattress is universally considered the best for fibromyalgia, as different outlets have different recommendations and some focus on related conditions rather than fibromyalgia specifically.