This leaflet gives a brief overview of the thyroid and parathyroid glands and the hormones that they make.
What are the thyroid and parathyroid glands?
Both the thyroid and parathyroid glands are endocrine glands. This means they make and release (secrete) hormones. Hormones are chemicals which can be released into the bloodstream. They act as messengers, affecting cells and tissues in distant parts of your body. Thyroid hormones affect the body's metabolic rate and the levels of certain minerals in the blood. The hormone produced by the parathyroid also helps to control the amount of these essential minerals.
Where is the thyroid gland?
The thyroid gland is found in the front part of your neck. It is made up of two lobes - the right and the left lobes. These two lobes are joined by a small bridge of thyroid tissue called the isthmus. The two lobes lie on either side of your windpipe (trachea).
The thyroid gland makes three hormones that it releases (secretes) into the bloodstream. Two of these hormones, called thyroxine (T4) and triiodothyronine (T3), increase your body's metabolic rate. Essentially, the body's metabolic rate is how quickly the cells in your body use the energy stored within them. Thyroid hormones make cells use more energy. By controlling how much energy our cells use, thyroid hormones also help to regulate our body temperature. Heat is released when energy is used, increasing our body temperature. Thyroid hormones also play a role in making proteins, the building blocks of the body's cells. They also increase the use of the body's fat and glucose stores.
In order to make T3 and T4, the thyroid gland needs iodine, a substance found in the food we eat. T4 is called T4 because it contains four atoms of iodine. T3 contains three atoms of iodine. In the cells and tissues of the body most T4 is converted to T3. T3 is the more active hormone; it influences the activity of all the cells and tissues of your body.
The other hormone that the thyroid makes is called calcitonin. This helps to control the levels of calcium and phosphorus in the blood. These minerals are needed, among other things, to keep bones strong and healthy.
How does the thyroid work?
The main job of the thyroid gland is to produce hormones T4 and T3. To do this the thyroid gland has to take a form of iodine from the bloodstream into the thyroid gland itself. This substance then undergoes a number of different chemical reactions which result in the production of T3 and T4.
The activity of the thyroid is controlled by hormones produced by two parts of the brain - the hypothalamus and the pituitary gland. The hypothalamus receives input from the body about the state of many different bodily functions. When the hypothalamus senses that levels of T3 and T4 are low, or that the body's metabolic rate is low, it releases a hormone called thyrotropin-releasing hormone (TRH). TRH travels to the pituitary gland via the connecting blood vessels. TRH stimulates the pituitary gland to release (secrete) thyroid-stimulating hormone (TSH).
TSH is released from the pituitary gland into the bloodstream and travels to the thyroid gland. Here, TSH causes cells within the thyroid gland to make more T3 and T4. T3 and T4 are then released into the bloodstream where they increase metabolic activity in the body's cells. High levels of T3 stop the hypothalamus and pituitary gland from secreting more of their hormones. In turn this stops the thyroid gland producing T3 and T4. This system ensures that T3 and T4 should only be made when their levels are too low.
Calcitonin is released by the thyroid gland if the amount of calcium in the bloodstream is high. Calcitonin decreases the amount of calcium and phosphorus in the blood. It does this by slowing the activity of cells found in bone, called osteoclasts. These cells cause calcium to be released as they 'clean' bone. Calcitonin also accelerates the amount of calcium and phosphorus taken up by bone. Calcitonin works together with parathyroid hormone to regulate calcium levels (see below in the parathyroid section for full explanation).
Some disorders of the thyroid gland
- Cancer of the thyroid (thyroid cancer)
- Thyroid swelling (goitre).
- Thyroid nodules. These are lumps in the thyroid gland, which are usually non-cancerous (benign).
- Overactive thyroid (hyperthyroidism).
- Underactive thyroid (hypothyroidism).
Because the thyroid gland produces hormones which travel in the blood and affect body systems, a problem with the gland usually leads to symptoms elsewhere in the body. Symptoms and signs vary depending on the thyroid disease or problem - see the individual leaflets linked above for details.
There are a number of tests (investigations) which may be carried out to check on the thyroid gland. Which test is done depends on the symptoms or signs which you have. See the leaflets on the individual conditions for the tests done in each particular problem. Tests which might be done for people with thyroid issues include:
- Blood tests. This includes thyroid function tests and thyroid antibody tests.
- An ultrasound scan of the neck.
- Special thyroid scans. See the separate leaflet called Thyroid Scans and Uptake Tests for more information.
- Taking a sample of tissue for analysis (a biopsy).
Where are the parathyroid glands?
The body has four parathyroid glands. They are small, pea-sized glands, located in the neck just behind the butterfly-shaped thyroid gland. Two parathyroid glands lie behind each 'wing' of the thyroid gland.
The parathyroid glands release a hormone called parathyroid hormone. This hormone helps to control the levels of three minerals in the body: calcium, phosphorus and magnesium. Parathyroid hormone functions/effects in the body include:
- It causes the release of calcium from bones.
- It causes calcium to be taken up (absorbed) into the blood from the intestine.
- It stops the kidneys from getting rid of (excreting) calcium in the urine.
- It causes the kidneys to excrete phosphate in the urine.
- It increases blood levels of magnesium.
How do the parathyroids work?
Normally, parathyroid hormone release is triggered when the level of calcium in the blood is low. When the calcium level rises and is back to normal, the release of parathyroid hormone from the parathyroids is suppressed. However, parathyroid hormone and calcitonin work together to control calcium levels in the blood. The blood calcium level is the main stimulus for the release of these hormones, as the release of these hormones is not controlled by the pituitary gland.
When the calcium level is high in the bloodstream, the thyroid gland releases calcitonin. Calcitonin slows down the activity of the osteoclasts found in bone. This decreases blood calcium levels. When calcium levels decrease, this stimulates the parathyroid gland to release parathyroid hormone. Parathyroid hormone encourages the normal process of bone breakdown (essential for maintenance and growth of the bone). This process of bone breakdown releases calcium into the bloodstream. These actions raise calcium levels and counteract the effects of calcitonin. By having two hormones with opposing actions, the level of calcium in the blood can be carefully regulated.
Parathyroid hormone also acts on the kidneys. Here it slows down the amount of calcium and magnesium filtered from the blood into the urine. Parathyroid hormone also stimulates the kidneys to make calcitriol, the active form of vitamin D. Calcitriol helps to increase the amount of calcium, magnesium and phosphorus absorbed from your guts (intestines) into the blood.
Some disorders of the parathyroid glands
- Overactive parathyroid (hyperparathyroidism).
- Underactive parathyroid (hypoparathyroidism).
- Tumours of the parathyroid, such as parathyroid adenoma and parathyroid cancer.
As with the thyroid, the parathyroid glands produce hormones which travel in the blood and affect body systems, so a problem with the gland usually leads to symptoms elsewhere in the body. Symptoms and signs vary depending on the parathyroid problem - see the individual leaflets linked above for details.
There are a number of tests (investigations) which may be carried out to check on the parathyroid glands. Which test is done depends on the symptoms or signs which you have. Possible tests for people with parathyroid symptoms include:
- Blood tests:
See the leaflets on the individual conditions for the tests done in each particular problem.
Further reading and references
; WikiBooks - Open Books for an Open World
; Thyroid UK
; Thyroid UK