Mattress Firmness

Research on mattress firmness and back pain generally suggests that medium-firm mattresses may offer the most benefit for individuals with chronic low back pain. Several studies have shown improvements in sleep quality and a reduction in back pain when switching from firm to medium-firm surfaces. For example, a study with 313 participants indicated that medium-firm mattresses led to a 48% decrease in back pain and a 55% improvement in sleep quality. These mattresses help maintain proper spinal alignment and reduce pressure on key points like shoulders and hips.

https://jorthoptraumatol.springeropen.com/articles/10.1186/s10195-021-00616-5

See what Harvard Medical School has to say

https://www.health.harvard.edu/pain/what-type-of-mattress-is-best-for-people-with-low-back-pain

My Recommendation

Medium-firm is a great starting point.