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The greater splanchnic nerve (GSN) arises from the sympathetic chain in the spinal cord's thoracic region. The GSN innervates the upper gastrointestinal tract's distal segment and the foregut derivatives, providing inhibitory signals to these visceral organs. This nerve also plays a crucial role in the "fight or flight" response and visceral pain transmission to the spinal cord. Clinically, the GSN is responsible for some cases of chronic upper abdominal pain. Surgical interventions exist for patients with pain unresponsive to traditional pharmacologic therapy.[1][2][3][4] Understanding the anatomy and functions of this nerve is essential for diagnosing and managing abdominal and visceral conditions and addressing chronic pain syndromes.