Early polio symptoms: what to know

Early polio symptoms may resemble a viral illness, while new weakness or breathing difficulty requires urgent assessment. Early features can include fever, sore throat, headache, nausea, vomiting, stomach discomfort, tiredness or muscle pain. Many illnesses cause these symptoms, so they do not identify polio on their own.

Poliovirus infection can affect the nervous system. Warning features include severe muscle pain, neck or back stiffness, unusual sensitivity, reduced reflexes, or weakness that may progress, often affecting one side or particular limbs. Difficulty swallowing or breathing is especially concerning. A person’s vaccination history, travel or exposure to someone with infection helps clinicians judge the situation.

Contact a healthcare service promptly if polio is a possibility, and describe the first symptom, its timing, travel and immunisation history. Avoid close contact with vulnerable people until advice is given, wash hands carefully and do not share cups or utensils. Do not wait for weakness to become severe before seeking assessment. Review routine protection through Childhood Immunisation.

Call emergency services for new or worsening weakness, trouble breathing or swallowing, inability to stand, severe drowsiness, or rapidly worsening illness. A child with fever and weakness should be assessed urgently. Keep the person safe from falls and follow emergency instructions while help is arranged.

Ask whether symptoms require isolation or testing, which warning signs should trigger emergency help, and whether immunisations are up to date. Tell the clinician about recent travel, exposure, previous doses and any new weakness or breathing change.