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The thoracic splanchnic nerve block has been used in managing abdominal pain, especially for pains arising from abdominal cancers. A 27-year-old male patient who had a constant abdominal pain was referred to our clinic for pain management but had no organic disease. The numeric rating scale (NRS) for pain scored 7/10. We applied a diagnostic thoracic splanchnic nerve block under the diagnosis of functional abdominal pain syndrome. Since the block reduced the pain, we applied a radiofrequency thermocoagulation at the T11 and T12 vertebral level. Thereafter, his symptoms improved markedly with pain decreasing to an NRS score of 2-3/10. Hereby, we report a successful management of functional abdominal pain via radiofrequency thermocoagulation of the thoracic splanchnic nerves. (Korean J Anesthesiol 2011; 61: 79-82) Key Words: Functional abdominal pain syndrome, Radiofrequency thermocoagulation, Thoracic splanchnic nerve block. Radiofrequency thermocoagulation of the thoracic splanchnic nerve in functional abdominal pain syndrome-A case report