Is it common for people under ~35 to have so much back pain and medical issues? I thought back pain in young people is usually related to something like a bad i

Is it common for people under ~35 to have so much back pain and medical issues? I thought back pain in young people is usually related to something like a bad injury. I get back pain when I'm working at the desk a lot, but that's at the end of 14+ hour days sitting around with minimal movement.