Most cases of back pain are related to issues in human musculoskeletal system and are not related to severe diseases. Musculoskeletal problems also called mechanical because many of them linked to vertebrae physical motions. Back pain itself is not considered a diagnosis, but rather a symptom of underlying (in most cases musculoskeletal) problems. following:
Steps to reduce the risk of returning back pain caused by musculoskeletal problems
References
Musculoskeletal causes of back pain Wikipedia(Text) CC BY-SA