Acute spinal cord injury (SCI) in the United States affects approximately 40 million people, equating to around 18,000 cases annually. SCI exhibits a bimodal age distribution, primarily impacting young adults and individuals over 60 years old, with the average age at injury increasing from 28.7 to 42 years over recent decades. SCI can result from traumatic events like automobile crashes, falls, and gunshot wounds, as well as non-traumatic causes such as congenital disorders, vascular anomalies, neoplasms, and infections. The mechanisms of injury include compression, contusion, laceration, and vascular damage, each affecting different neural pathways within the spinal cord. SCI can involve cervical, thoracic, thoracolumbar, or lumbar regions, with cervical injuries being most common. Types of SCI include complete and incomplete lesions, hemisection (Brown-Séquard syndrome), anterior, posterior, and central cord syndromes, and conus medullaris and cauda equina syndromes. The most frequently reported post-SCI neurological condition is incomplete tetraplegia. The American Spinal Injury Association (ASIA) Impairment Scale (AIS) is essential for classifying SCIs, guiding treatment, and providing prognostic information. It captures sensory and motor function and categorizes injuries as complete or incomplete. Complete lesions show no function below the injury level, while incomplete lesions retain partial function. The AIS is a reliable and validated tool for predicting ambulatory outcomes. Overall, SCIs present diverse and complex clinical challenges, necessitating thorough assessment and tailored management strategies to address the wide range of impairments associated with these injuries.