Subacute thyroiditis (subacute thyroiditis) is associated with viral infections and is usually preceded by a history of upper respiratory tract infections or mumps, and is commonly seen in women. The disease is typically characterized by mild hyperthyroidism in the acute phase: panic, fever, sweating, irritability, insomnia, hand tremors, hyperphagia, increased stool frequency, and other hypermetabolic symptoms. In the early stage of the disease, there may be fever, headache, sore throat, and peripheral discomfort. Gradual or sudden pain in the thyroid area, which may radiate to the jaw, behind the ear, behind the neck, and both shoulders. Palpation reveals mild to moderate, diffuse or nodular enlargement of the thyroid gland, mostly on one side, with a hard texture. In laboratory tests, the total blood leukocyte count is usually normal or slightly high in the acute phase, with markedly increased sedimentation and elevated globulin levels. Anti-thyroid microsomal antibodies (TMAb) and anti-thyroglobulin antibodies (TGAb) are often undetectable or show slightly elevated titers. Thyroid uptake of 131I is significantly reduced or not absorbed, and serum thyroid hormone levels are elevated or normal. Ultrasound may show significant hypoechogenicity, which is helpful in the diagnosis of subxiphoid thyroiditis. In the recovery period, thyroid function levels return to normal and thyroid uptake rate of 131I returns to normal or slightly higher. A small number of patients develop hypothyroidism, with decreased serum T3 and T4 and increased TSH. Cases with atypical clinical manifestations should be noted. The disease is often confused with hyperthyroidism. Patients with hyperthyroidism can be differentiated by elevated serum thyroid function levels and elevated thyroid uptake of 131I, whereas thyroiditis is isolated. Do not misdiagnose this disease as hyperthyroidism and give long-term anti-thyroid medication. The disease should be differentiated from chronic lymphocytic thyroiditis, nodular goiter, acute suppurative thyroiditis, and thyroid adenoma (or cancer). The prognosis for this disease is recurrence in 2% of patients. In advanced stages, the inflammatory response of the thyroid gland decreases to disappearance, there may be lymphocytic infiltration, follicular regeneration and fibrosis, mild hyperthyroidism, hypofunction or normal, and about 10% of patients develop clinical hypothyroidism, requiring lifelong thyroxine replacement therapy. How to effectively prevent subacute thyroiditis 1, moderate action to prevent subacute thyroiditis can not lack exercise, proper exercise can enhance physical fitness and prevent infection. 2, the emotional aspect of many diseases are related to energy, so the combination of work and rest, life in order, to prevent the disease is a great help. The actual fact is that there is really a great deal of difficulty in preventing this disease, however, the regularity of the meals, survival and living, not overworked, cheerful state of mind has a great meaning to prevent the occurrence of thyroiditis. The actual fact is that you can find a lot of people who have been in the business for a long time. You should always eat high quality empty cabbage, celery cabbage, soybeans and oats on weekdays. Dates and peanuts contain a lot of fiber, which is also very helpful in preventing this disease.