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Suggestions for mattress for people with bulging disk in their back? - is arthritis and disk degeneration the same thing

My uncle has three arched windows in the back and wakes up every morning hurting.We hard and said to go up a foundation mattress. He sees foam and latex mattresses. Is there anyone who has suggestions that help us to decide who is good mattress with pain alivate help. For fifty years, and has some arthritis.