Acute flaccid paralysis (AFP) is commonly caused by Guillain-Barré syndrome (GBS), an autoimmune condition where rapid onset of weakness results from peripheral nerve and root inflammation. Clinical features of GBS include symmetrical ascending weakness, diminished reflexes, sensory involvement, and potential respiratory impairment in 1/4 of cases. Subtypes include inflammatory demyelinating or axonal forms. Treatment focuses on immunotherapy like IVIG or plasma exchange to hasten recovery. Traumatic neuritis is defined as acute nerve inflammation after injury, causing asymmetric flaccid paralysis within hours to days without fever or cranial nerve involvement.