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We present the case of a 72-year-old woman who was diagnosed with Hashimoto's thyroiditis and who developed a low-grade fever, fatigue, and weight loss that prompted to perform a thyroid biopsy to rule out an underlying primary thyroid lymphoma. This case report offers the opportunity to review the association between Hashimoto's thyroiditis and primary thyroid lymphoma. Furthermore, it underlines the importance of considering the diagnosis of lymphoma when a thyroid mass is found in patients with an underlying Hashimoto's disease, as the timely management is essential for survival with this rare thyroid condition.