Thyroiditis is an autoimmune related disease, the most common being Hashimoto’s thyroiditis, with a reported incidence of up to 10%, and is the main cause of hypothyroidism. It is a major cause of hypothyroidism. It is mainly found in women between 40 and 60 years of age, with typical ultrasound images of an enlarged thyroid gland that shrinks later in life, with coarse echogenic dots and scattered hypoechoic areas, which can be judged on the basis of the images. The main diagnosis is based on clinical laboratory indicators, increased antibodies and blood flow can be abundant. Thyroiditis is an infectious disease, the most common is subthyroiditis, ultrasound performance echogenicity is not uniform, there are local hypoechoic areas, put the probe on it to check the patient pain. Asking if there is a history of preexisting colds can help with the diagnosis.