Acute thyroiditis generally refers to acute suppurative thyroiditis, a type of pyogenic infectious disease. For instance, many patients may exhibit symptoms of an upper respiratory tract infection or experience swelling, pain, or difficulty swallowing in the lateral aspect of the thyroid in the anterior neck following a fine needle aspiration biopsy of a thyroid nodule. The local skin over the thyroid may display erythema or heat, and some may also have systemic symptoms of a febrile disease, such as increased body temperature, generalized body aches, and fatigue, along with swelling and pain in the cervical lymph nodes. Thus, the primary symptoms of acute thyroiditis are infectious, accompanied by symptoms of compression pain due to thyroid enlargement.