subacute thyroiditis is an inflammation of the thyroid gland, often triggered by a viral infection. It typically causes pain in the neck and can lead to symptoms such as fatigue, fever, and changes in thyroid hormone levels. The condition usually affects young to middle-aged adults, particularly women. The inflammation can result in a temporary overproduction of thyroid hormones, leading to hyperthyroidism symptoms, followed by a phase of hypothyroidism. Most patients recover fully within a few months, and treatment may include pain relievers and, in some cases, corticosteroids to reduce inflammation.