About 1 percent of polio cases can develop into paralytic polio. Paralytic polio leads to paralysis in the spinal cord (spinal polio), brain stem (bulbar polio), or both (bulbospinal polio).
Initial symptoms are similar to non-paralytic polio. But after a week, more severe symptoms will appear. These symptoms include:
- loss of reflexes
- severe spasms and muscle pain
- loose and floppy limbs, sometimes on just one side of the body
- sudden paralysis, temporary or permanent
- deformed limbs, especially the hips, ankles, and feet
In 5–10 percent of the polio paralysis cases, the virus will attack the muscles that help you breathe and cause death.