Backache or back pain is one of the most common reasons people seek medical help or miss work. Back pain is a leading cause of disability worldwide.
Lower backache
Lower back pain, sometimes called lumbago, is not a specific disease diagnosis. 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:
- ligaments and muscles
- discs
- intervertebral discs
- nerves
- the bony structures that make up the spine, called vertebral bodies or vertebrae
It can also be due to a problem with nearby organs, such as the kidneys.
https://www.mayoclinic.org/diseases-conditions/back-pain/symptoms-causes/syc-20369906
