Guillain-Barre syndrome (GBS) is an acute inflammatory demyelinating polyneuropathy. In typical cases, the first symptoms of GBS are pain, numbness, paresthesia, weakness in the limbs. Autonomic involvement is common and causes urinary retention and ileus. Much of these symptoms overlap with those of lumbar spinal stenosis. Therefore, correct diagnosis of GBS in a patient with symptomatic lumbar spinal stenosis or in a patient with atypical manifestations of GBS can be difficult, especially early in the course of GBS. Here, we report on a case of atypical GBS in a 74-year-old previously healthy patient with lumbar spinal stenosis and discuss the differential diagnosis of the GBS and lumbar spinal stenosis.