Polio

Also called Poliomyelitis or Post-polio syndrome

Polio is a serious infection caused by a virus that spreads through contact with the poo or droplets of an infected person. Most people have no or mild flu-like symptoms, but in a small number it affects the nerves and causes paralysis. Vaccination has made it very rare in most of the world.

Last updated Nov 9, 2026

What it is

There is no cure, so vaccination is the best protection. The polio vaccine is part of routine childhood vaccination.

Some people who had polio years ago develop new weakness, tiredness and pain later in life (post-polio syndrome), which is managed with therapy and support.

Common signs

  • Mild flu-like symptoms, such as fever and sore throat
  • Muscle pain or stiffness
  • Sudden weakness or floppiness of the arms or legs
  • In post-polio syndrome, new muscle weakness and tiredness

How it is usually diagnosed

  • Tests on samples of poo, throat or spinal fluid
  • Examination of nerves and muscles

Records worth keeping

Keeping these together makes each appointment easier, especially when you see a new doctor:

  • Vaccination records
  • Test results
  • Neurology and rehabilitation letters

Questions to ask your doctor

  • Are my vaccinations up to date?
  • Do I need a booster before travelling?
  • What support is there for post-polio symptoms?

When to get help right away

Call 112 or go to the nearest emergency department if you have:

  • Sudden weakness or paralysis, or difficulty breathing or swallowing: call 112

This page is general information. It is not a diagnosis and does not replace a doctor who knows your history. Medfold keeps your records organised; it does not interpret them.

Sources