What is growth hormone?
Growth hormone (GH) is one of the key hormones, released from the pituitary gland at the base of the brain, that drives height growth through childhood. It acts largely through an intermediary molecule called IGF-1, made in the liver, which stimulates the growth plates at the ends of bones to lengthen. GH is released in a pulsatile rhythm through the day, most intensely during deep sleep — one reason adequate sleep matters for growth.
Height does not depend on growth hormone alone; genetics, nutrition, thyroid hormones, chronic illness and overall health are all determinants. Growth hormone is an important but not the only part of this picture.
Growth hormone deficiency
Growth hormone deficiency is a relatively rare cause among the causes of short stature; the great majority of short stature is familial or constitutional and unrelated to hormone deficiency. When deficiency is present, the typical clue is a marked slowing of growth velocity and the child leaving their own percentile channel. In some cases bone age is also delayed.
So a single short-stature reading is not enough to suspect growth hormone deficiency; the real warning is sustained slow growth over time. When suspected, evaluation is done by paediatric endocrinology using growth history, bone age, blood tests (including IGF-1) and, where needed, special stimulation tests and imaging.
An overview of diagnosis and treatment
Growth hormone deficiency is not diagnosed by a single test, because the hormone is released in pulses and a one-off measurement can mislead. So the clinical picture, growth chart, bone age and special tests are assessed together. When confirmed, deficient children may be considered for growth hormone treatment under clinician supervision; this is given only for genuine deficiency or specific medical conditions, by specialist decision.
An important point: growth hormone is not a solution for every short child. In familial or constitutional short stature, hormone treatment is not appropriate. So correctly understanding the cause first is essential; avoiding unnecessary treatment is as important as catching deficiency.
Sleep, nutrition and growth
Because most growth hormone is released during deep sleep, regular, adequate sleep is one of the natural supporters of healthy growth. Likewise, balanced nutrition supplies the building blocks the hormone needs to act; severe undernutrition can slow growth independent of any hormonal state.
So the soundest way to support a child’s growth is not mysterious supplements or “height-increasing” products, but adequate sleep, balanced nutrition, regular activity and timely management of health problems. If there is real concern about growth, the right step is a paediatrician — not advertised products.