Hi swidorest,
There are of course many causes for back issues that can be very individual and it would depend on where the issues were and on the underlying cause of the problem. For example a mattress that is too firm could cause upper back issues while a mattress that is too soft could cause lower back issues. Of course there are many other possibilities as well depending on the specifics of your mattress and your “symptoms”. There is some general information in post #2 here and in post #45 here but in most cases the most effective approach would be a more detailed conversation with the manufacturer or retailer of your mattress who would probably have good experience with others who have similar “symptoms” to you and would be able to make suggestions that have the best odds of success.
Just like going to a doctor when you have certain “symptoms” … when you have “symptoms” on a mattress then the goal is to provide as complete and detailed a description of the symptoms and circumstances as possible to the retailer or manufacturer so that they can use their knowledge and experience with helping others to make suggestions that have the best odds of providing a solution.
Phoenix