“Shoulder pain is a common and disabling complaint. The reported annual incidence of shoulder pain in primary care is 14.7 per 1000 patients per year with a lifetime prevalence of up to 70%,” according to a 2011 BioMed Central report on musculoskeletal disorders. That’s why finding the right mattress is so important. Of course, it’s not just about finding the right mattress for shoulder pain. You also need to find the best mattress for side sleepers or back sleepers, as the wrong mattress for the way you sleep can also serve to exacerbate shoulder and/or back pain.