Back pain can have causes that are due to underlying desease.
Lwer back pain, also called lumbago, is not a disorder. It’s a symptom of several different types of medical problems.
It usually results from a problem with one or more parts of the lower back, such as:
Overuse such as working out or lifting too much, prolonged sitting and lying down, sleeping in an uncomfortable position or wearing a poorly fitting footwear, Flat feet, etc.