Im 20.my back always hurts and i haven't done anything strenuous. what is wrong?how can i improve pain without meds. i'm not pregnant or overweight.

Could be: Could be inflamamtory arthritis like seronegative spondyloarthropathy or herniated disks. See your doctor for further evaluation.

Exercise : Need to be more proactive in terms of daily exercise program in terms of flexibility & cardio along with core strengthening while limiting prolonged positioning especially sitting which generates 4 times body weight across the discs of the lower back . If a smoker stop. You can try otc meds if no medical reasons not to and if pain persists, see pcp.