An imbalance of electrolytes causes problems with spasms.
Things like this can happen to anyone, no matter how healthy.
A back injury could do it.
No, back spasms would't cause a person to collapse. More likely, a spasm causes a person to abruptly stand still, bend in the direction that gives the most relief, and causes a "seizing" or tightness in the back muscles that are affected. Typically, if the person can lean or bend holding onto a wall or piece of furniture, or sit or lie down, the spasm eases and the person can move about again. Most back pain has spasms of varying degrees.
I have back spasms.
mostly stress
toxins
What causes spasms in the front right pelvic area?
My massive penis
Back spasms are very painful cramps in the back muscles. The pain can be the consequence of overdoing it through an athletic workout or just moving erroneous while getting out of bed or even doing a household chore. Most of the back spasms will affect the lower area of the back. You can lighten the pain of a muscle cramp in the back through certain home remedies. https://globalinfocus.com/perfect-home-remedies-for-back-spasms
One might find information about treating muscle spasms at the online site WebMD. They have great details on the causes and potential treatments for these spasms.
The spasms you are feeling are muscle spasms. Muscle spasms are mostly caused by dehydration so you should try to hydrate yourself to stop them.