Pinched spinal nerves can develop suddenly or gradually. Sudden compression usually occurs in the setting of an acute joint problem called a “herniated disc,” also discussed in more detail elsewhere.
Environmental loads, stresses, and strains (associated with gravity, or even the furniture you rest on) can be balanced and contained by optimal posturing.
“Arthritis” is an umbrella term used to explain inflammation, joint pain and joint disease in one or more joints. There are more than 100 types of arthritis, and RA is the second-most common.