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The release of human growth hormone is not continuous since it is released in a number of ‘bursts’ or pulses every three to five hours.

Growth hormone is released into the bloodstream from the anterior pituitary gland. The pituitary gland also produces other hormones that have different functions from the growth hormone.

Growth hormone acts on many parts of the body to promote growth in children. Once the growth plates in the bones (epiphyses) have fused growth hormone does not increase height. In adults, it does not cause growth but it helps to maintain normal body structure and metabolism, including helping to keep blood glucose levels within set levels.

How is growth hormone controlled?

Growth hormone release is not continuous; it is released in a number of ‘bursts’ or pulses every three to five hours. This release is controlled by two other hormones that are released from the hypothalamus (a part of the brain): growth hormone-releasing hormone, which stimulates the pituitary to release growth hormone, and somatostatin, which inhibits that release.

Growth hormone levels are increased by sleep, stress, exercise, and low glucose levels in the blood. They also increase around the time of puberty. Growth hormone release is lowered in pregnancy and if the brain senses high levels of growth hormone or insulin-like growth factors already in the blood.

What happens if I have too much growth hormone?

Not surprisingly, too much growth hormone causes too much growth. In adults, excessive growth hormone for a long period of time produces a condition known as acromegaly, in which patients have swelling of the hands and feet and altered facial features. These patients also have organ enlargement and serious functional disorders such as high blood pressure, diabetes, and heart disease. Over 99% of cases are due to benign tumors of the pituitary gland, which produces the growth hormone. This condition is more common after middle age when growth is complete so affected individuals do not get any taller.

Very rarely, increased growth hormone levels can occur in children before they reach their final height, which can lead to excessive growth of long bones, resulting in the child being abnormally tall. This is commonly known as gigantism (a very large increase in height).

Overproduction of growth hormone is diagnosed by giving a sugary drink and measuring the growth hormone level over the next few hours. The sugar should cause growth hormone production to reduce. However, this does not happen in acromegaly.

What happens if I have too little growth hormone?

Too little growth hormone (deficiency) results in poor growth in children. In adults, it causes a reduced sense of well-being, increased fat, increased risk of heart disease, and weak heart, muscles, and bones. The condition may be present from birth where the cause can be unknown, genetic, or due to injury to the pituitary gland (during development or at birth).

Growth hormone deficiency may also develop in adults due to brain injury, a pituitary tumor, or damage to the pituitary gland (for example, after brain surgery or radiotherapy for cancer treatment). The main treatment is to replace the growth hormone using injections – either once a day or several times a week.

In the past, growth hormone treatment was stopped at the end of growth. It is now clear that growth hormone contributes to both bone mass and muscle mass reaching the best possible level, as well as reducing fat mass during the development of an adult. The specialist is therefore likely to discuss the benefits of continuing growth hormone after growth has been completed until age 25 to make sure bone and muscle mass reach the best possible level. Additionally, growth hormone has been linked to a sensation of well-being, specifically energy levels.

There is evidence that 30-50% of adults with growth hormone deficiency feel tired to a level that impairs their well-being. These adults may benefit from lifelong treatment with the growth hormone. Taking the growth hormone as an adult will not result in increased height.

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