Guillain-Barré syndrome is a disorder where the immune system attacks the peripheral nervous system, damaging nerves and causing tingling, muscle weakness, and paralysis. It occurs in about 1 in 100,000 people and most often between ages 30-50. While it can occur at any age, it is rare in children under 2. Guillain-Barré syndrome may be triggered by viral infections and results in loss of reflexes and muscle function. Diagnosis involves neurological exams, spinal fluid tests, and electrodiagnostic tests like electromyography. Treatment focuses on reducing symptoms through antibiotics, analgesics, plasmapheresis, and immunoglobulin therapy to speed recovery.