Glossary

Browse through glands, hormones and endocrine conditions.
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TSH-secreting pituitary adenoma

TSH-secreting pituitary adenomas are slow-growing pituitary tumours that produce thyroid stimulating hormone (TSH) and are a very rare cause of hyperthyroidism (overactive thyroid).

Thyrotropin-releasing hormone

Thyrotropin-releasing hormone is produced by the hypothalamus. It plays an important role in the regulation of thyroid gland activity.

Tertiary hyperparathyroidism

Tertiary hyperparathyroidism means excess production of parathyroid hormone that has escaped all normal body feedback controls and so persists even in cases where the initial cause (low blood calcium) has been corrected.

Thyroid stimulating hormone

Thyroid stimulating hormone is produced by the pituitary gland. Its role is to regulate the production of hormones by the thyroid gland.

Toxic thyroid nodule

Toxic thyroid adenoma results in excessive thyroid hormone production from a single nodule in the thyroid gland. The excess thyroid hormone production can no longer be controlled by the body thereby resulting in hyperthyroidism.

Thyroid eye disease

Thyroid eye disease is an autoimmune condition that affects the eyes causing swelling, inflammation and sometimes visual problems.

Triiodothyronine

Triiodothyronine is a thyroid hormone that plays vital roles in the body's metabolic rate, heart and digestive functions, muscle control, brain development and the maintenance of bones.

Turner syndrome

Turner syndrome is a chromosomal disorder affecting the equivalent of one in 2,500 girls, producing a number of features including short stature, failure to enter puberty and infertility.

Thyroid cancer

Thyroid cancer is the uncontrolled growth of cells in the thyroid gland which may spread to areas around the thyroid and other parts of the body. Thyroid cancer can affect people of all ages but most patients are cured by the treatments now available.

Thyrotoxicosis

Thyrotoxicosis is a medical condition caused by an excessive amount of thyroid hormones in the bloodstream.

Thyroid gland

The thyroid gland is part of the endocrine system and is responsible for producing and releasing thyroid hormones into the bloodstream.

Testosterone

Testosterone is a hormone that is responsible for many of the physical characteristics specific to adult males. It plays a key role in reproduction and the maintenance of bone and muscle strength.

Thyroxine

Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland. It plays vital roles in digestion, heart and muscle function, brain development and maintenance of bones.

Testes

The testes are two oval-shaped male reproductive glands that produce sperm and the hormone testosterone.


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