The spine is fully loaded whenever you are upright or even bent forward as long as you are not using aids to walk (cane, walker or shopping cart). Without the use of aids, the portion of the spine that is loaded changes with different positions. When fully upright, there is approximately 30% load on the facets and 70% on the discs in the lower back. If you bend forward, the load increases on the discs and decreases on the facets. Visa versa if you extend backwards.
Dizziness and headaches are not associated with the lower back. However, increased pain can be associated with these symptoms. Post-concussion syndrome is highly associated with dizziness and headaches.
Donald Corenman, MD, DC is a highly-regarded spine surgeon, considered an expert in the area of neck and back pain. Trained as both a Medical Doctor and Doctor of Chiropractic, Dr. Corenman earned academic appointments as Clinical Assistant Professor and Assistant Professor of Orthopaedic Surgery at the University of Colorado Health Sciences Center, and his research on spine surgery and rehabilitation has resulted in the publication of multiple peer-reviewed articles and two books.