Our spine starts from head and ends at pelvis and its divided into three parts upper ,middle and lower.Upper part is called cervical spine,middle part is called thoracic spine and lower part is called lumbar spine. upper and lower back have higher mobility than middle. so chances of problems are more in lower or lumbar spine (lower back) and upper or cervical spine (upper back). Lower back problems mostly start with bad posture or direct injury.Bad posture lead to muscle spasms that alter the curvature of spine which further can lead to disc prolapse.