May 12, 2025 - Secondary hyperthyroidism occurs when the thyroid gland produces too much thyroid hormone. It is often be caused by a benign tumor.

The main differential diagnoses of secondary hyperthyroidism include thyrotropin-secreting neuroendocrine pituitary tumors (TSH-PitNETs) and resistance to thyroid hormone. As a rare cause of secondary hyperthyroidism, ectopic thyrotropin-producing ...

September 19, 2025 - Secondary hyperparathyroidism happens when another health condition causes a low level of calcium in the body. Over time, the amount of parathyroid hormone in the body rises as the parathyroid glands try to raise the calcium level to a healthy range.

April 9, 2019 - Secondary hyperparathyroidism is a condition in which too much parathyroid hormone (PTH) is produced.

July 28, 2023 - There is no single treatment that is best for all patients with hyperthyroidism. The treatment that you and your doctor decide on will take into account factors such as your age, your symptoms, and other medical problems (ex. heart disease). It also depends on the cause of hyperthyroidism and how abnormal the tests are.

March 19, 2023 - There are 2 subtypes of AIT: type 1 and type 2. Type 1 AIT leads to increased thyroid hormone production secondary to excess iodine exposure from amiodarone in the setting of pre-existing thyroid disease (as seen in the Jod-Basedow phenomenon).[38] The pre-existing thyroid disease is usually multinodular goiter or latent Graves disease.

Secondary hyperthyroidism is a complex endocrine disorder that occurs when the pituitary gland produces excessive amounts of thyroid-stimulating hormone (TSH), leading to increased thyroid hormone production.

This type of hyperthyroidism can follow a viral infection which causes inflammation of the thyroid gland. This inflammation causes the thyroid to release excess amounts of thyroid hormone into the blood stream which leads to hyperthyroidism.

November 14, 2025 - If a tumor in your pituitary gland is releasing excess amounts of thyroid-stimulating hormone (TSH), which then stimulates your thyroid to produce excess thyroid hormones, it would be called secondary hyperthyroidism.

Primary hyperthyroidism is due to thyroid pathology. The thyroid is behaving abnormally and producing excessive thyroid hormone. Secondary hyperthyroidism is due to pathology in the hypothalamus or pituitary.

September 27, 2025 - The key difference between primary and secondary hyperthyroidism lies in their origin: primary hyperthyroidism stems from thyroid gland dysfunction (most com...

Secondary hyperparathyroidism is a condition in which a disease outside of the parathyroid glands causes all of the parathyroid glands to become enlarged and hyperactive. The most common causes of secondary hyperparathyroidism are kidney failure and vitamin D deficiency.

November 30, 2022 - Understand what happens when your thyroid is overactive and learn about treatment for this condition.

What is not appreciated is that there are secondary causes of isolated systolic hypertension. These include anemia, aortic insufficiency, Paget's disease, beriberi, and hyperthyroidism (Figure 1).

June 28, 2024 - Primary hyperthyroidism: the pathology is within the thyroid gland. Secondary hyperthyroidism: the thyroid gland is being stimulated by excessive thyroid-stimulating hormone (TSH) in the circulation.

June 6, 2024 - When you have low levels of vitamin D, your body absorbs less calcium, and the level of calcium in your blood becomes low. This signals your parathyroid glands to make more PTH and grow larger, which causes SHPT. Your doctor may also call this "renal secondary hyperparathyroidism".

March 1, 2016 - The most common cause of an excessive passive release of thyroid hormones is painless (silent) thyroiditis, although its clinical presentation is the same as with other causes. Hyperthyroidism caused by overproduction of thyroid hormones can be treated with antithyroid medications (methimazole and propylthiouracil), radioactive iodine ablation of the thyroid gland, or surgical thyroidectomy.

As similar biochemical picture is found in patients with thyroid hormone resistance (RTH), a differential diagnosis between the two disorders must be performed. Therefore, a correct diagnosis is fundamental in order to prevent dramatic consequences, such as improper thyroidectomy in patients with secondary hyperthyroidism due to TSHoma or unnecessary pituitary surgery in patients with RTH.

Thyroid disorders caused by ... hypothyroidism. The cause of secondary hypothyroidism is failure of the pituitary gland to secrete thyroid stimulating hormone (TSH)....