<s>[INST] Hi doctor, My wife and I just bought a new mattress, and both are experiencing lower back pain when bending forward. We used to sleep on a soft and firm (dual mattresses controlled by air) mattress. The new one is a memory foam which is considered soft but is firm under the very soft three to four inches. The fact that we both feel lumbar soreness, which makes me think that the mattress is not adjusting. Should we go for a firmer or softer mattress? Or stay away from foam altogether? [/INST] Hi. For further queries consult a physiotherapist online --> </s>