Fever symptoms in thyroiditis mainly refer to acute suppurative thyroiditis and subacute thyroiditis. Acute suppurative thyroiditis is a purulent infectious disease, often a mixed bacterial infection, commonly occurring after upper respiratory infections or fine-needle aspiration of thyroid nodules. Symptoms can include thyroid enlargement, pain, difficulty swallowing, fever, and other systemic symptoms. Broad-spectrum antibiotics can be used for initial treatment. If the pathogen is identified, the type of antibiotic can be adjusted. Some patients may require incision and drainage if an abscess is present, and in very rare cases, complications such as tracheal obstruction or mediastinitis may occur. Additionally, patients with subacute thyroiditis may also experience fever, usually a mild to moderate increase in body temperature, and in some cases, it can reach 40°C. The fever typically peaks around the third to fourth day and subsides in about a week. Patients with this type of fever can generally use non-steroidal anti-inflammatory drugs, and since subacute thyroiditis is a self-limiting disease, whether the fever in thyroiditis is dangerous depends on the situation.