Growth Hormone Disorders

Introduction

Growth hormone disorders are conditions in which the body produces either too little or too much growth hormone. The effects depend on age. In children, growth hormone disorders most often show up as a problem with height and physical development. In adults, they tend to affect body composition, energy, bone strength, and the structure of the face and hands.

If you or your child has been told that a growth hormone problem is suspected or confirmed, you are likely now thinking about what comes next — the tests, the treatment, what daily life will look like, and how long care will continue. This guide explains how growth hormone disorders are evaluated, what treatment usually involves, and what to expect over months and years of follow-up.

Growth hormone (sometimes called GH or somatotropin) is made by the pituitary gland — a small, pea-sized gland at the base of the brain. The pituitary releases growth hormone in short bursts, mostly during sleep. Growth hormone then travels to the liver and other tissues, where it triggers the release of another hormone called insulin-like growth factor 1 (IGF-1). IGF-1 carries out many of growth hormone’s effects on the body.

Together, growth hormone and IGF-1 help:

• Drive growth in height during childhood and adolescence
• Build and maintain muscle and bone
• Regulate how the body uses fats, proteins, and sugars
• Support energy, mood, and overall well-being

A growth hormone disorder is anything that disrupts this system — either by producing too little hormone or too much.

Growth Hormone Deficiency

Growth hormone deficiency (GHD) means the pituitary does not make enough growth hormone. In children, this typically shows up as slow growth and short stature. In adults, GHD can occur on its own or as part of broader pituitary failure (called hypopituitarism), and tends to affect body composition, energy, and metabolic health rather than height.

Growth Hormone Excess

When the pituitary produces too much growth hormone, the resulting condition depends on age:

• Gigantism — when excess growth hormone occurs in a child or adolescent whose growth plates are still open. This causes very rapid growth and unusually tall stature.
• Acromegaly — when excess growth hormone develops in adulthood, after the growth plates have closed. Height does not increase, but the bones of the hands, feet, jaw, and forehead thicken, and many organ systems are affected over time.

Both gigantism and acromegaly are almost always caused by a benign tumour of the pituitary gland called a pituitary adenoma.

Causes and Risk Factors

The causes of growth hormone disorders differ between deficiency and excess, and between children and adults.

Causes of Growth Hormone Deficiency

In children, growth hormone deficiency may be:

• Congenital — present from birth, sometimes due to genetic mutations or structural problems in how the pituitary developed
• Acquired — developing later in childhood after a brain tumour (such as craniopharyngioma), brain surgery, radiation to the head, head injury, infection, or autoimmune damage to the pituitary
• Idiopathic — meaning no specific cause can be found. This is common, and it does not change the approach to treatment.

In adults, growth hormone deficiency most often follows damage to the pituitary or hypothalamus from a pituitary tumour, surgery for a tumour, radiation therapy to the brain, severe head injury, or, less commonly, autoimmune or inflammatory conditions affecting the pituitary.

Causes of Growth Hormone Excess

Almost all cases of acromegaly and gigantism are caused by a benign tumour in the pituitary gland that secretes growth hormone. In rare cases, tumours elsewhere in the body produce a hormone called growth hormone-releasing hormone (GHRH), which stimulates the pituitary to overproduce growth hormone.

A small number of cases are linked to inherited genetic syndromes, such as multiple endocrine neoplasia type 1 (MEN1), Carney complex, or familial isolated pituitary adenoma. These tend to be considered when the disorder appears in younger people or runs in families.

What Does Not Cause Growth Hormone Disorders

It is worth saying clearly: growth hormone disorders are not caused by parenting choices, by “not eating enough,” or by lifestyle. Nutrition matters for healthy growth, and severe undernutrition can slow growth, but a true growth hormone disorder is a medical condition of the pituitary system. Families should not blame themselves.

Signs and Symptoms

If you are reading this because evaluation is already under way, the symptom list below is more about understanding what your endocrinologist is seeing than about diagnosing yourself. Symptoms vary by age and by whether growth hormone is too low or too high.

Signs of Growth Hormone Deficiency in Children

• Slow growth velocity — the child grows in height more slowly than peers of the same age and sex
• Short stature relative to expected family height
• A “younger-looking” face for the child’s age
• Increased fat around the trunk, with reduced muscle
• Delayed puberty in older children
• Otherwise normal intelligence and proportions

Children with GH deficiency usually look healthy, which is why charting height over time is so important. A single measurement matters less than the trend.

Signs of Growth Hormone Deficiency in Adults

• Reduced energy and stamina
• Loss of muscle mass and strength
• Increased body fat, especially around the waist
• Thinning skin
• Reduced bone density over time
• Low mood, reduced sense of well-being
• Sometimes, raised cholesterol and changes in heart risk markers

Signs of Acromegaly and Gigantism

Symptoms develop slowly — often over years — which is why acromegaly is frequently diagnosed late.

• Gradually enlarging hands and feet (rings, gloves, and shoes no longer fit)
• Coarsening of facial features, including a more prominent jaw and forehead, larger nose, and wider gaps between teeth
• Joint pain and stiffness
• Excessive sweating and oily skin
• Headaches
• Snoring and obstructive sleep apnoea
• Carpal tunnel syndrome
• High blood pressure and high blood sugar or diabetes
• Menstrual irregularities or reduced libido
• Vision changes (if the pituitary tumour presses on nearby nerves)

Diagnosing a growth hormone disorder is rarely about a single test. Because growth hormone is released in pulses throughout the day, a one-off blood level is not reliable. Endocrinologists put together several pieces of information.

Clinical and Growth Assessment

For children, the foundation of diagnosis is careful measurement and plotting of height, weight, and growth velocity over time. The endocrinologist compares the child’s growth pattern to standard growth charts and to the expected height range based on the heights of the parents. A child whose growth has slowed or fallen across percentile lines warrants further evaluation, even if the absolute height is still within the normal range.

For adults, the focus is on the history — pituitary tumour, brain surgery, radiation, or head injury combined with symptoms suggestive of deficiency or excess.

Blood Tests

Useful blood tests may include:

• IGF-1 level: Because IGF-1 levels are more stable through the day than growth hormone itself, IGF-1 is often the first screening test. A low IGF-1 raises the suspicion of deficiency; a high IGF-1 raises the suspicion of acromegaly.
• Other pituitary hormones: Thyroid hormones, cortisol, prolactin, and sex hormones are often measured because problems with the pituitary often affect more than one hormone.
• Blood sugar, cholesterol, and other metabolic markers

Stimulation and Suppression Tests

To confirm the diagnosis, dynamic tests are often needed:

• Stimulation tests are used to diagnose growth hormone deficiency. The body is given a medication (such as glucagon, clonidine, arginine, or insulin) that should trigger growth hormone release. Blood is then drawn several times to see how the pituitary responds. A poor response supports the diagnosis.
• Oral glucose suppression test is used to diagnose acromegaly. Normally, drinking glucose should suppress growth hormone. In acromegaly, levels remain high.

These tests are performed in a controlled setting because some carry medical risks that need supervision.

Imaging

An MRI scan of the pituitary is usually done when a pituitary problem is suspected. It can identify a pituitary adenoma, a developmental abnormality, or signs of damage to the gland.

Bone Age

In children, an X-ray of the left hand and wrist is often used to estimate bone age — how mature the bones are compared with the child’s actual age. A delayed bone age in a short child can support the diagnosis of growth hormone deficiency and helps predict remaining growth potential.

Treatment of Growth Hormone Deficiency

Treatment depends on the specific diagnosis. For growth hormone deficiency, the mainstay is replacement of the missing hormone.

Recombinant Human Growth Hormone

Growth hormone is replaced with recombinant human growth hormone (rhGH), a synthetic version of the natural hormone, produced in a laboratory. It is given by a small daily injection under the skin, usually in the evening, to mimic the body’s natural pattern of release. Newer long-acting forms are also becoming available in some settings, given less frequently.

Daily injections sound daunting, but families often find that with the right pen device and a few training sessions, the process becomes routine. The injection is small and uses a fine needle.

Children with Growth Hormone Deficiency

In children, the goal of treatment is to support normal growth and help the child reach a final adult height closer to their genetic potential. The Endocrine Society and pediatric endocrinology guidelines recommend that growth hormone treatment in children with confirmed deficiency be started as early as the diagnosis is established, because the years before the growth plates close are when treatment has the most effect.

Doses are based on the child’s weight and adjusted over time based on growth response, IGF-1 levels, and side effects. Children are typically reviewed every three to six months. Treatment usually continues until growth is complete and the growth plates have closed, after which the need for ongoing therapy is reassessed.

Adults with Growth Hormone Deficiency

Adults with confirmed growth hormone deficiency may also be candidates for growth hormone replacement, particularly if symptoms and quality of life are significantly affected. The dose used in adults is much lower than in children. Treatment is typically continued long-term, with regular monitoring of IGF-1 levels, body composition, and metabolic markers.

Not every adult with biochemical GH deficiency will need or choose treatment. The decision involves weighing symptoms, other pituitary problems, and overall health goals with the endocrinologist.

Side Effects of Growth Hormone Therapy

Recombinant growth hormone is generally well tolerated when prescribed by a specialist and monitored carefully. Possible side effects include:

• Fluid retention and swelling, especially in adults
• Joint or muscle aches
• Headaches
• Insulin resistance or higher blood sugar in some people
• Slipped capital femoral epiphysis (a hip problem in growing children) — rare but important to recognise
• Worsening of scoliosis if already present

Most side effects are dose-related and improve with dose adjustment. Long-term safety has been studied for decades; current guidance from the Endocrine Society and pediatric endocrinology bodies considers growth hormone therapy safe in appropriately selected patients under specialist supervision.

What Growth Hormone Is Not Used For

Growth hormone is sometimes promoted on the internet for “anti-ageing” or muscle-building in healthy adults. Major endocrinology societies do not support these uses. Growth hormone outside of a confirmed medical diagnosis is not a recognised clinical indication and can carry real risks. Similarly, growth hormone is not appropriate for healthy children who are short but growing normally.

Treatment of Growth Hormone Excess (Acromegaly and Gigantism)

When growth hormone is too high, the goals are different: lower hormone levels to normal, control or remove the tumour, relieve symptoms, and reduce long-term complications. The Endocrine Society guidelines describe a stepwise approach combining surgery, medication, and, in some cases, radiation therapy.

Pituitary Surgery

Surgery to remove the pituitary adenoma is generally considered the first-line treatment for most patients with acromegaly or gigantism caused by an operable tumour. The most common approach is transsphenoidal surgery, in which a neurosurgeon reaches the pituitary through the nose and the sphenoid sinus, without an external incision. When the tumour is small and contained, surgery can produce long-term remission for many patients.

Medication

When surgery does not fully control hormone levels, or when surgery is not possible, medications are used. Three main classes are described in guidelines:

• Somatostatin receptor ligands (such as octreotide and lanreotide) — these slow growth hormone release and can shrink the tumour
• Dopamine agonists (such as cabergoline) — useful in milder cases or in combination with other treatments
• Growth hormone receptor antagonists (pegvisomant) — these block the action of growth hormone at the tissue level and are used when other medications do not adequately normalise IGF-1

Medications may be used before surgery (to shrink the tumour), after surgery (if hormone levels remain high), or as the main treatment when surgery is not appropriate.

Radiation Therapy

Radiation, often as stereotactic radiosurgery, may be considered when surgery and medication have not achieved control. Radiation works gradually, often over years, so medications are usually continued in the meantime.

Managing the Complications of Excess

Acromegaly and gigantism affect many body systems. Care includes screening and treatment for:

• High blood pressure
• Diabetes or pre-diabetes
• Heart problems, including changes to the heart muscle
• Sleep apnoea
• Joint and spine problems
• Increased risk of colon polyps, often screened with colonoscopy

Hormone levels often improve with treatment, but some changes to bones and features may only partially reverse. Earlier treatment generally leads to better outcomes.

Lifestyle and Self-Management

Lifestyle measures do not replace medical treatment for growth hormone disorders, but they support overall health and help with some of the symptoms.

Nutrition

A balanced diet with adequate protein, calcium, and vitamin D supports bone and muscle development in children and helps preserve them in adults. Children on growth hormone treatment do not need special “growth diets” — ordinary healthy eating is what is recommended. Adults with acromegaly or GH deficiency may need extra attention to blood sugar and cardiovascular risk, often with input from a dietitian.

Physical Activity

Regular, age-appropriate physical activity supports muscle, bone, and cardiovascular health. For children, ordinary play and sports are encouraged. Adults often find that strength and aerobic exercise help with energy and body composition. People with acromegaly may need to work around joint pain or sleep apnoea, so exercise plans are individualised.

Sleep

Growth hormone is released mostly during deep sleep, particularly in children. Good sleep habits matter. In adults with acromegaly, untreated sleep apnoea is a recognised concern and is worth raising with the endocrinologist if snoring or daytime sleepiness are present.

Emotional Well-being

Living with a growth hormone disorder particularly visible changes in height or features can affect self-esteem, body image, and social confidence. Children may face teasing or feel different from peers. Adults with acromegaly often describe distress about changes in their appearance. Counselling, peer support, and open conversations with family can be very helpful and are part of comprehensive care.

Monitoring and Long-Term Care

Growth hormone disorders are long-term conditions, and care extends over years.

What Monitoring Usually Involves

• For children on growth hormone therapy: regular measurement of height, weight, and growth velocity; IGF-1 levels; thyroid function; bone age every one to two years; and assessment of puberty progress
• For adults on growth hormone therapy: IGF-1 levels, body composition assessment, lipid profile, blood sugar, and bone density over time
• For acromegaly: IGF-1 and growth hormone levels, pituitary MRI at intervals, screening for complications such as diabetes, heart disease, sleep apnoea, and colon polyps

Doses are adjusted based on how the body responds, not on a fixed schedule.

Adherence

Daily injections, regular blood tests, and frequent clinic visits ask a lot of patients and families. Skipping doses or missing reviews can reduce the benefit of treatment. Setting reminders, building injections into a routine (such as at bedtime), and involving older children in their own care can help.

Transition from Pediatric to Adult Care

Children with growth hormone deficiency reach a point where final height has been achieved. At that stage, the endocrinologist usually reassesses whether growth hormone deficiency persists into adulthood. Some adolescents can stop therapy; others need to continue at adult doses. A planned transition from pediatric to adult endocrinology — rather than an abrupt handover — helps avoid gaps in care.

Complications if Untreated

Without appropriate management, growth hormone disorders can lead to long-term problems.

Untreated Growth Hormone Deficiency

• In children: significantly reduced adult height, delayed puberty, reduced bone density
• In adults: reduced muscle and bone mass, increased body fat, raised cardiovascular risk markers, and reduced quality of life

Untreated Acromegaly and Gigantism

• Progressive enlargement of hands, feet, and facial bones
• Severe joint disease
• Diabetes
• High blood pressure and heart disease (a major cause of reduced life expectancy in untreated acromegaly)
• Sleep apnoea
• Increased risk of certain tumours, including colon polyps
• If the pituitary tumour grows large enough, vision loss and other neurological symptoms

These are reasons that early diagnosis and ongoing follow-up matter.

Growth Hormone Disorders in Children

Because growth hormone disorders so often present in childhood, several considerations are specific to children and their families.

How a Pediatric Endocrinologist Approaches the Evaluation

A pediatric endocrinologist will look at the whole picture: growth pattern over time, family heights, nutritional status, signs of other illnesses, results of blood tests, bone age, and where appropriate, a pituitary MRI. Not every short child has growth hormone deficiency — many are simply growing along their own genetic trajectory, or have constitutional delay (a normal pattern of later growth and puberty). Sorting one situation from the other is exactly what the evaluation is for.

Starting Growth Hormone Therapy in a Child

If treatment is started, families are taught how to give the daily injection, how to store the medication, and what to watch for. Initial visits are frequent — often every three months — to check growth response and adjust the dose. Most children adapt to the injections within a few weeks.

What Results to Expect

• How early treatment was started
• The severity of the deficiency
• Consistency with daily injections
• Other pituitary or general health issues
• Family (genetic) height potential

Many children with treated GH deficiency reach an adult height within their family’s expected range. Realistic expectations are part of the care conversation from the start.

School and Social Life

Children with growth hormone disorders can usually attend school normally and take part in activities. Where short stature affects confidence or leads to teasing, schools can help with practical adjustments and, importantly, with anti-bullying support. Parents often find it helpful to give the child age-appropriate ways to explain their treatment if asked by friends.

Gigantism in Children

Children with gigantism — the rare condition of growth hormone excess before the growth plates close — are managed by the same combination of pituitary surgery, medication, and (in some cases) radiation as adults with acromegaly. The earlier the diagnosis, the better the chance of preventing extreme height and the complications that follow.

Living with a Growth Hormone Disorder

With consistent treatment and follow-up, most people with growth hormone disorders live full, active lives. Children grow, attend school, take part in sport, and move into adulthood. Adults with treated deficiency often describe improvements in energy, body composition, and well-being over time. People with treated acromegaly can see hormone levels return to normal, symptoms improve, and complications stabilise.

The condition does require lifelong awareness. That means keeping up with appointments, taking medication consistently, and staying alert to new symptoms that might suggest a change in pituitary function or in the complications of past disease.

Frequently Asked Questions

Will my child reach a normal adult height?

Many children with treated growth hormone deficiency achieve an adult height within their family’s expected range, especially when treatment begins early and is taken consistently. The endocrinologist can give a more personalised estimate based on the child’s bone age, growth response, and severity of deficiency.

Is growth hormone therapy safe for long-term use?

Growth hormone therapy has been used for decades and is considered safe by major endocrinology societies when prescribed for a confirmed medical indication and monitored by a specialist. Side effects are usually dose-related and manageable. Long-term safety data continue to support its use in appropriately selected patients.

Do the daily injections hurt?

The injections use a very fine, short needle and are given just under the skin. Most children and adults describe them as a small pinch rather than painful. Pen-style injectors make the process simpler.

Can growth hormone be taken as a pill?

No. Growth hormone is a protein and would be broken down in the stomach if swallowed. It needs to be given by injection. Newer long-acting injectable forms can reduce the frequency of injections in some cases.

Is short stature always due to a growth hormone problem?

No. Most short children are healthy and growing normally for their family. Growth hormone disorders are only one of many possible explanations for short stature. A pediatric endocrinologist sorts out which children need investigation and which do not.

Can growth hormone disorders be cured?

It depends on the cause. Acromegaly caused by an operable pituitary adenoma can sometimes be cured by surgery. Growth hormone deficiency, particularly when due to a structural pituitary problem, often requires lifelong replacement. The aim of treatment is to restore normal hormone levels and prevent complications, whether or not the underlying condition can be reversed.

Will my child have to take growth hormone forever?

Not necessarily. Some children with growth hormone deficiency — particularly those with idiopathic or isolated deficiency — produce enough growth hormone as adults and can stop treatment when growth is complete. Others continue at adult doses for life. Retesting at the end of growth is a standard part of care.

Can lifestyle, diet, or supplements correct a growth hormone disorder?

Good nutrition, sleep, and activity are important for general health and support growth, but they do not correct a true growth hormone deficiency or excess. Over-the-counter “growth boosters” and supplements are not recognised treatments and should be discussed with the endocrinologist before use.

Conclusion

Growth hormone disorders — whether deficiency or excess — are conditions of the pituitary system that affect growth in children and many aspects of health in adults. Diagnosis combines careful clinical assessment, blood tests, dynamic stimulation or suppression testing, and imaging. Treatment options are well-established: hormone replacement for deficiency, and a combination of surgery, medication, and sometimes radiation for excess.

What matters most is that growth hormone disorders are manageable. With specialist endocrinology care, daily commitment to treatment, and regular follow-up, most children and adults can expect meaningful improvement in growth, symptoms, and long-term health. The path is a long one — often years — but it is well-mapped, and the people walking it with you, from your endocrinologist to the rest of the care team, do this work every day.