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Initially misdiagnosed with pancreatitis, he underwent hospitalization, fasting, and parenteral nutrition (PN) for 15\u2009days. Despite this, his symptoms persisted, and serum lactate levels progressively increased. Transferred to a university hospital, abdominal beriberi was suspected, and intravenous thiamine was promptly administered. Symptoms resolved within 24\u2009h. A review of the PN prescribed revealed the absence of thiamine, confirming the diagnosis. Healthcare professionals often associate thiamine deficiency with alcoholic adults presenting Wernicke encephalopathy; however, abdominal beriberi should also be considered in children with acute abdomen, especially when elevated serum lactate indicates impaired cellular metabolism due to thiamine deficiency.<\/jats:p>","DOI":"10.1155\/crpe\/4401612","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T15:47:02Z","timestamp":1782488822000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Abdominal Pain and Hyperlactatemia in Thiamine Deficiency: A Case Report"],"prefix":"10.1155","volume":"2026","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0871-5491","authenticated-orcid":false,"given":"Luciana 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