A 48-year-old man experienced a third-degree anaphylactic reaction two hours after consuming tuna, resulting in a significant drop in blood pressure. This reaction occurred despite the individual having no prior history of food allergies. The incident highlights the potential for unexpected allergic responses, even to commonly consumed foods. Medical professionals responded to the emergency, treating the man for anaphylactic shock. The case underscores the importance of being aware of potential allergic reactions and seeking immediate medical attention if symptoms develop. Further investigation may be needed to determine the cause of this first-time allergic response to tuna. The man’s current condition is not detailed in the report.