Thyroiditis is an inflammation of the thyroid gland, which is located in the front of the neck and produces hormones that regulate metabolism. This condition can lead to either an underactive thyroid, known as hypothyroidism, or an overactive thyroid, referred to as hyperthyroidism. There are several types of thyroiditis, including Hashimoto's thyroiditis, which is an autoimmune disorder, and subacute thyroiditis, often triggered by a viral infection. Symptoms of thyroiditis can vary depending on the type and severity of the inflammation. Common signs include fatigue, weight changes, sensitivity to temperature, and changes in heart rate. Diagnosis typically involves blood tests to measure hormone levels and the presence of antibodies. Treatment may include medications to manage symptoms and restore hormone balance