{Reference Type}: Case Reports {Title}: Sudden-Onset Severe Back Pain Caused by Acute Gastric Anisakiasis. {Author}: Yamamoto R;Miyagami T;Nishizaki Y;Nishimura H;Tsumura Y;Naito T; {Journal}: Cureus {Volume}: 16 {Issue}: 1 {Year}: 2024 Jan 暂无{DOI}: 10.7759/cureus.52124 {Abstract}: Anisakiasis is a parasitic disease that usually causes acute abdominal pain, nausea, and vomiting after the ingestion of raw seafood. We present a case of anisakiasis in an 80-year-old man who complained of sudden-onset severe back pain that was reminiscent of aortic dissection. This case shows that anisakiasis should be considered as a possible differential diagnosis in patients with not only abdominal pain but also back pain. In addition, for "diagnostic excellence," it is essential to return to a comprehensive medical history that allows the reassessment of the diagnosis even when it differs from the initial differential diagnosis.