Sudden paralysis is caused by strokes and spinal cord injuries. But paralysis occurs due to various problems with the nervous system.

For example, autoimmune diseases such as multiple sclerosis (MS), neurological conditions such as amyotrophic lateral sclerosis (ALS), bacterial infections, and inborn abnormalities like spina bifida can cause paralysis.

However, the most common causes of sudden paralysis involve strokes and spinal injuries, as well as brain injuries.