Paralysis from polio: what to know

Polio is a viral infection that can occasionally affect the nerves controlling muscles. Weakness may begin in one limb or several limbs, feel uneven from side to side, and progress over a short period. Muscles may become floppy rather than stiff. The throat and breathing muscles can also be affected, making swallowing, coughing or breathing difficult.

A diagnosis cannot be made from weakness alone. Doctors consider the pattern of symptoms, recent illness, vaccination history and possible exposure, then arrange urgent tests and monitoring. Other conditions can cause sudden weakness, so rapid assessment matters.

Treat new or worsening weakness as an emergency, especially when it follows fever, headache, vomiting or muscle pain. Do not ask the person to walk unsupported if the legs are weak. Note when the weakness began, which areas are affected, and any trouble swallowing or breathing for the medical team.

Avoid close contact with others until clinicians advise you, and wash hands carefully after using the bathroom or helping with personal care. Discuss prevention through [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/), including whether any household member has missed recommended doses.

Call emergency services for sudden weakness, inability to stand, choking, difficulty swallowing, weak cough, breathlessness or unusual sleepiness. Breathing can deteriorate when the muscles between the ribs or the diaphragm are affected. Do not wait for a fever or pain to return before seeking help.

Ask which tests are needed, how breathing and swallowing will be monitored, whether infection-control precautions apply, what rehabilitation support may be needed, and whether family members require vaccination review or medical advice.