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Hypothyroidism is classified as either primary, secondary, or tertiary. Primary hypothyroidism is for when the cause is due to an abnormality of the thyroid gland, secondary hypothyroidism is when the cause is decreased thyroid-stimulating hormone levels, and tertiary hypothyroidism is when the cause is an inadequate amount of thyrotropin-releasing hormone being released.
Thyroiditis is generally caused by an immune system attack on the thyroid, resulting in inflammation and damage to the thyroid cells. This disease is often considered a malfunction of the immune system and can be associated with IgG4-related systemic disease, in which symptoms of autoimmune pancreatitis, retroperitoneal fibrosis and noninfectious aortitis also occur.
Postpartum thyroiditis can recur in subsequent pregnancies. [2] [4] [5] Drug-induced thyroiditis can occur in individuals receiving certain therapies such as amiodarone, interferon-alpha, lithium, tyrosine-kinase inhibitors, and immunotherapies among other drugs. These individuals may develop subacute lymphocytic thyroiditis. [2] [3] [4] [5]
De Quervain's thyroiditis, also known as subacute granulomatous thyroiditis or giant cell thyroiditis, is a self-limiting inflammatory illness of the thyroid gland. [1] De Quervain thyroiditis is characterized by fever , flu-like symptoms , a painful goiter , and neck pain .
Acute infectious thyroiditis (AIT) also known as suppurative thyroiditis, microbial inflammatory thyroiditis, pyrogenic thyroiditis and bacterial thyroiditis. [ 1 ] [ 2 ] [ 3 ] The thyroid is normally very resistant to infection.
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The accuracy of the diagnosis depends on obtaining tissue from all of the suspicious areas of an abnormal thyroid gland. The reliability of fine needle aspiration is increased when sampling can be guided by ultrasound, and over the last 15 years, this has become the preferred method for thyroid biopsy in North America. [32] [citation needed]
Canine herpesvirus is an infectious disease that is a common cause of death in puppies less than three weeks old. [7] Pseudorabies (Morbus Aujeszky) is an infectious disease that primarily affects swine, but can also cause a fatal disease in dogs with signs similar to rabies. [8]