Paralytic polio symptoms: what to know

Paralytic polio occurs when poliovirus affects nerve cells involved in movement. A person may first feel feverish, tired or achy, then develop weakness in an arm, leg or other muscle group. The weakness may be floppy, uneven or increasingly difficult to use. Muscle pain, reduced reflexes and difficulty coordinating movement can occur.

If the nerves that control the throat or breathing muscles are involved, symptoms may include choking, a weak cough, trouble swallowing, a nasal-sounding voice or breathlessness. These signs can appear alongside weakness or become noticeable later. Other illnesses can produce similar symptoms, so an examination is essential.

Sudden weakness should be assessed urgently even if it seems mild or follows a short flu-like illness. Record the time symptoms began, how they have changed, and whether swallowing, speech or breathing is affected. Keep the person safe from falls and do not offer food or drink if swallowing is unsafe.

Tell the clinical team about travel, possible exposure and vaccination history. Prevention depends on recommended [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/); a clinician can check whether doses are up to date and advise close contacts.

Call emergency services immediately for new weakness that is spreading, inability to walk, choking, difficulty swallowing, a weak cough, blue lips, pauses in breathing or severe drowsiness. Do not drive someone who is struggling to breathe. Keep them upright if comfortable and follow emergency instructions while help is on the way.

Ask whether the pattern suggests a nerve or muscle problem, which tests will clarify the cause, how swallowing and breathing will be checked, what precautions are needed, and when rehabilitation or specialist follow-up should begin.