Post-polio syndrome (
PPS, or
post-poliomyelitis syndrome or
post-polio sequelae) is a condition that affects approximately 25–50% of people who have previously survived an acute attack of
poliomyelitis —a
viral infection of the
nervous system—after the initial infection. Typically the symptoms appear 15–30 years after recovery from the original
paralytic attack, at an age of 35 to 60. Symptoms include acute or increased
muscular weakness,
pain in the
muscles, and
fatigue. The same symptoms may also occur years after a nonparalytic polio (NPP) infection.