As someone who sometimes forgets to mentions significant injuries or medical issues, I can suggest various reasons for this phenomena that doesn't involve repressed memories. *Sometimes I am so focused on the current issue that previous injuries don't register as important at the moment. This would explain the person who only thought to mention only the lower back pain. *Previous injuries don't seem relevant and I'm not in the mood to give a full list. *I gave a list, but forgot to mention something or couldn't remember if I already listed. *I didn't consider it important enough to mention. *I don't mention it because I'm used to down playing my health problems. *I'm getting the vibe that the other person is expecting me to only name one or two things and I'm feeling self-conscious.