Boy, how long do you have for a dissertation on spinal disorders? I can break this down into mechanics but cannot give you a long list of what can cause these symptoms. When you run or exercise, you generally are upright. That is your lumbar lordosis (the front/back curve in your back) is high. This loads the facets with higher forces and unloads the discs. When you are sitting and looking at a computer. you are flexed forward which loads your discs more than the facets. If you have disc problems, this will cause pain.
Without knowing your disorder, you could get a kangaroo desk attachment which allows you to stand while using your computer.
PLEASE REMEMBER, THIS FORUM IS MEANT TO PROVIDE GENERAL INFORMATION ON SPINE ANATOMY, CONDITIONS AND TREATMENTS. TO GET AN ACCURATE DIAGNOSIS, YOU MUST VISIT A QUALIFIED PROFESSIONAL IN PERSON.
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.