What should you know about how polio affects the body?

Polio is a viral infection. Many infections cause mild or no noticeable illness, but the virus can sometimes reach the nervous system. Injury to motor nerve cells can lead to weakness, reduced movement, or paralysis, often affecting the limbs. Muscles used for breathing or swallowing can also be involved.

Early illness may include fever, tiredness, headache, nausea, vomiting, or limb and muscle pain. Nervous-system involvement can cause severe muscle weakness, reduced reflexes, or stiffness in the neck and back. Some people who had paralytic polio later develop new muscle weakness, fatigue, pain, or reduced endurance, which needs individual assessment rather than self-diagnosis.

If polio is suspected, contact a healthcare service promptly and mention recent travel, vaccination history, contact with an unwell person, and the timing of symptoms. Do not share towels or eating utensils while awaiting advice. Vaccination is the main preventive measure; review your record with a clinician and follow the local immunisation schedule.

Call emergency services for new or rapidly worsening weakness, difficulty breathing, choking, trouble swallowing, or inability to move an arm or leg. Urgent assessment is also needed for severe headache with neck stiffness, confusion, or reduced alertness.

Could my symptoms involve the nervous system, what tests or infection-control steps are needed, and is my vaccination record complete? If I had polio in the past, how can weakness or fatigue be assessed safely?