Polio in the leg: symptoms and next steps

Poliovirus can injure motor nerve cells in the spinal cord. When those signals are disrupted, one leg or both legs may feel weak, move less, or become difficult to use. The affected limb may seem floppy rather than stiff, and muscles can become smaller over time if nerve supply remains impaired. Pain, fever, tiredness or stomach symptoms may happen before weakness. A leg problem has many possible causes, including injury, pressure on a nerve and other neurological conditions, so a clinician must assess the pattern rather than relying on the symptom alone.

For new or worsening weakness, contact a clinician promptly and note whether it started suddenly, which movements changed, and whether fever, swallowing or breathing symptoms are present. Avoid forcing a weak limb or attempting exercises without guidance. Keep vaccination records available and ask about any missed doses; routine immunisation is the main way to prevent polio. See [Childhood Immunisation](/treatments/preventive-care-and-vaccination/childhood-immunisation/) for related information.

Get urgent help for sudden inability to move a leg, rapidly worsening weakness, weakness involving an arm or face, trouble swallowing, a weak cough, or difficult breathing. These symptoms can signal involvement of more than a single limb or of muscles needed for breathing. Do not wait for a routine appointment when strength is changing quickly.

Ask what examinations are needed to distinguish nerve weakness from a joint or muscle problem, whether testing for infection is appropriate, and how to protect the limb while awaiting results. Confirm the immunisation record and the plan for follow-up.