Mattresses for sore backs

[mtbc]

Some of my father's family have lower back problems. I have to be careful with mine, being careful about how I lift, and sitting with good lumbar support. I've done fairly well over recent months but sometimes I awaken with a moderately sore back and it improves over the morning. My current mattress is basically a large block of firm foam with a memory foam topper.

I wonder if I should get a different mattress. But, they are expensive things, and it is not obvious which ones might be a worthwhile improvement. I probably won't make any immediate changes while I ponder the matter.