Lactic acidosis is the most common anion gap metabolic acidosis in critically ill patients. Type B lactic acidosis is most commonly seen with hematological malignancies, especially lymphomas. It is considered an oncological emergency and is associated with high mortality and poor outcomes if not treated promptly. Here, we present the case of a 48-year-old male who developed Type B lactic acidosis secondary to newly diagnosed diffuse large B-cell lymphoma. This case highlights the importance of including Type B lactic acidosis in the differential diagnosis in a patient with unexplained lactic acidosis and hypoglycemia with otherwise vague symptoms and the need for a thorough search for quick diagnosis and early management.
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