Growth Hormone Deficiency

What is growth hormone deficiency?

Growth hormone deficiency is a condition in which the pituitary gland — a small, pea-sized gland at the base of the brain — does not make enough growth hormone. Growth hormone (sometimes called GH or somatotropin) is a chemical messenger that helps children grow taller and, in people of all ages, supports healthy muscle, bone, and metabolism. When the body does not produce enough of it, growth in children slows down, and adults may notice changes in body composition, energy, and overall well-being.

Many people first ask a simple question: what is growth hormone deficiency in practical terms? In children, it usually means growing much more slowly than expected for their age, even though body proportions typically stay normal. In adults, it is subtler — there is no height to lose, so the condition tends to show up as fatigue, reduced muscle strength, increased body fat, and changes in mood or quality of life.

The condition can be present from birth (congenital) or develop later in life (acquired). It affects both children and adults, and it can occur on its own or together with deficiencies of other pituitary hormones. Growth hormone deficiency is classified under the code E23.0 in the International Classification of Diseases (ICD-10), which covers hypopituitarism — a general term for underactivity of the pituitary gland.

It is important to know that growth hormone deficiency is a recognized, treatable medical condition. It is not caused by poor parenting, diet alone, or a child simply being “a late bloomer,” although doctors will carefully rule out other, more common reasons for slow growth before making the diagnosis.

Symptoms of growth hormone deficiency

Growth hormone deficiency symptoms differ depending on when the condition begins. In children, the most visible sign is slow growth. In adults, the picture is less obvious and can overlap with many other health problems, which is one reason the condition may go unrecognized for years.

Symptoms in children

• Slow growth rate — often growing less than about 2 inches (5 centimeters) per year after early childhood, when peers are growing faster.
• Short stature — being noticeably shorter than children of the same age and sex, while body proportions remain normal.
• A younger-looking face — facial features may appear less mature than expected for the child’s age.
• Increased fat around the belly and face — often described as a “chubby” build despite normal eating habits.
• Delayed puberty — puberty may start later than in peers, or progress slowly.
• Delayed tooth development — baby teeth and adult teeth may come in later than usual.
• In newborns: low blood sugar (hypoglycemia), and in boys, a smaller-than-expected penis (micropenis), may be early clues when the deficiency is present from birth.

A child with growth hormone deficiency usually has normal intelligence and normal body proportions. The main clue is the growth pattern itself, which is why doctors track a child’s height and weight over time on a growth chart. A child who “falls off” their growth curve — dropping across percentile lines over months or years — deserves a medical evaluation.

Symptoms in adults

• Persistent fatigue and reduced stamina during everyday activities.
• Reduced muscle mass and strength, sometimes despite regular activity.
• Increased body fat, especially around the waist.
• Low mood, anxiety, or reduced sense of well-being; some adults describe feeling socially withdrawn.
• Reduced bone density, which over time can increase the risk of fractures.
• Changes in cholesterol levels, often found on routine blood tests.
• Dry or thin skin and reduced sweating in some people.

Because these adult symptoms are common in many conditions — including thyroid problems, depression, and simple lack of sleep — growth hormone deficiency in adults is usually suspected only when there is a known reason for pituitary damage, such as a pituitary tumor, brain surgery, radiation therapy to the head, or a significant head injury.

Causes and risk factors

Growth hormone deficiency causes fall into two broad groups: congenital (present at birth) and acquired (developing later). In a substantial number of children, no specific cause is ever found; doctors call this idiopathic growth hormone deficiency.

Congenital causes

• Genetic changes that affect how the pituitary gland develops or how growth hormone is produced. Some of these run in families.
• Structural problems of the brain or pituitary gland present from birth, such as an underdeveloped pituitary or abnormalities of the nearby brain structures.
• Certain congenital syndromes in which pituitary hormone deficiencies occur alongside other features.

Acquired causes

• Tumors in or near the pituitary gland or hypothalamus (the brain region that controls the pituitary). A tumor called craniopharyngioma is a well-known cause in children.
• Brain surgery in the region of the pituitary gland.
• Radiation therapy to the head or brain, for example as part of cancer treatment. Hormone deficiencies may appear months or years after radiation.
• Serious head injury (traumatic brain injury), which can damage the pituitary or its blood supply.
• Infections or inflammation affecting the brain or pituitary, such as meningitis or autoimmune inflammation of the gland.
• Reduced blood flow to the pituitary, including damage related to severe blood loss around childbirth in adults.

Risk factors

Risk factors reflect the causes above. People who have had brain tumors, cranial radiation, neurosurgery, or a significant head injury carry a higher risk. A family history of pituitary hormone problems can also raise the likelihood of congenital forms. In many children, however, growth hormone deficiency appears without any identifiable risk factor, and no one is at fault.

Diagnosis of growth hormone deficiency

Growth hormone deficiency diagnosis is a careful, stepwise process, because slow growth and fatigue have many possible explanations. Doctors do not confirm the condition from a single blood test, since growth hormone is released in short bursts — mostly during sleep — and a random measurement can be misleadingly low even in healthy people.

Growth tracking and physical examination

In children, the first and most important tool is the growth chart. Doctors measure height and weight accurately over time and compare them with standard curves and with the heights of the child’s parents. A persistently slow growth rate, or a downward drift across percentile lines, raises concern. The physical examination looks for signs of other conditions that can slow growth, such as thyroid disorders, chronic illnesses, or nutritional problems.

Blood tests

Initial blood tests often include:

• IGF-1 (insulin-like growth factor 1) — a substance the liver makes in response to growth hormone. Because IGF-1 levels are more stable through the day than growth hormone itself, they serve as a useful screening marker. A related marker, IGFBP-3, may also be measured.
• Thyroid, kidney, liver, and celiac disease tests — to rule out other causes of poor growth or fatigue.
• Other pituitary hormones — to check whether the pituitary gland is underperforming more broadly.

Growth hormone stimulation testing

The key confirmatory test is a growth hormone stimulation test (also called a provocation test). The person receives a medication known to trigger growth hormone release — examples include insulin, arginine, glucagon, or clonidine — and blood samples are taken at set intervals over a few hours. If the pituitary cannot raise growth hormone above a defined threshold despite this stimulation, the result supports the diagnosis. Doctors often require an inadequate response to two different stimulation tests, particularly in children, before confirming the condition. The exact thresholds vary by test, laboratory, and clinical guidelines, so results are always interpreted by a specialist.

Imaging and other studies

• MRI (magnetic resonance imaging) of the brain — a detailed scan used to look at the pituitary gland and surrounding structures, and to check for tumors or developmental abnormalities.
• Bone age X-ray — in children, an X-ray of the hand and wrist shows how mature the bones are. In growth hormone deficiency, bone age is often younger than the child’s actual age, which suggests there is remaining growth potential.
• Genetic testing — in selected cases, especially when the condition appears in infancy or runs in the family.

Diagnosis and long-term management are typically led by an endocrinologist — a doctor who specializes in hormone disorders. For children, this is a pediatric endocrinologist, usually working within a broader pediatrics department alongside growth specialists, radiologists, and, when needed, neurosurgeons.

Treatment options for growth hormone deficiency

Growth hormone deficiency treatment depends on the person’s age, the severity of the deficiency, the underlying cause, and whether other pituitary hormones are also affected. The mainstay of treatment for confirmed deficiency is growth hormone replacement therapy.

Growth hormone replacement therapy

Treatment uses recombinant human growth hormone — a laboratory-made version of the natural hormone. It is given as an injection under the skin (subcutaneous injection), traditionally once daily, usually in the evening to mimic the body’s natural nighttime release. In some countries, longer-acting formulations given once weekly are also available; your doctor can explain which options apply in your situation.

In children, the goals of treatment are to restore a normal growth rate and to help the child reach a final adult height closer to their genetic potential. Treatment usually continues through childhood and adolescence until growth is complete, which doctors confirm by monitoring the growth plates (the areas of growing tissue at the ends of long bones) on X-rays. In many cases, children who start treatment early respond well, though individual results vary and no specific final height can be promised.

In adults with confirmed deficiency, growth hormone replacement is aimed not at height but at improving body composition, bone density, energy, and quality of life. Doctors use lower doses in adults and adjust them gradually based on IGF-1 levels and symptoms.

Monitoring and dose adjustment

Anyone receiving growth hormone therapy needs regular follow-up. Visits typically include measurement of height and weight (in children), blood tests such as IGF-1, checks of blood sugar and thyroid function, and a review of side effects. Possible side effects can include headaches, fluid retention, joint or muscle aches, and, less commonly, effects on blood sugar; most are manageable with dose adjustment under medical supervision. Rarely, children may develop a hip condition or worsening curvature of the spine during rapid growth, which is one reason ongoing monitoring matters.

Watchful waiting and treating the underlying cause

Not every child with slow growth needs immediate hormone therapy. When test results are borderline, doctors may recommend a period of careful observation with repeat measurements before deciding. When growth hormone deficiency is caused by a tumor, treatment of the tumor — with surgery, radiation therapy, or both — comes first, and hormone replacement is planned around it. Surgery is directed at the underlying cause, not at the hormone deficiency itself; there is no operation that restores growth hormone production once the gland is damaged.

Replacing other missing hormones

When the pituitary gland is broadly underactive, people may also need replacement of thyroid hormone, cortisol (a stress hormone made by the adrenal glands), sex hormones, or other hormones. Coordinated care by an endocrinology team is important in these cases. In hospital settings such as Acibadem, this care is generally organized through endocrinology for adults and pediatric endocrinology for children.

Living with growth hormone deficiency and outlook

For most people, the outlook with proper diagnosis and treatment is favorable, although “cure” is usually not the right word. Growth hormone deficiency is often a lifelong condition that is managed rather than eliminated. Some children with idiopathic deficiency do regain normal growth hormone production after puberty, which is why doctors commonly retest young adults before deciding whether treatment should continue into adulthood.

Children who begin treatment early and take it consistently often achieve a growth rate and, in many cases, an adult height within or close to the normal range for their family — though outcomes vary and cannot be guaranteed. Missing doses regularly can reduce the benefit, so building injections into the daily routine helps. Many families find that children quickly adapt to the small subcutaneous injections, and modern injection pens are designed to make the process easier.

Adults on replacement therapy often report gradual improvements in energy, strength, and mood over months rather than days. Alongside medication, general health measures matter: a balanced diet, regular weight-bearing exercise to support bone and muscle, adequate sleep (when much of the body’s natural growth hormone is released), and attention to cardiovascular risk factors such as cholesterol and blood pressure.

Emotional well-being deserves attention too. Children who are much shorter than their peers may face teasing or self-esteem challenges, and adults with long-standing symptoms may have struggled with unexplained fatigue for years. Honest conversations with the care team, and psychological support when needed, are a legitimate part of managing this condition.

Frequently asked questions

What is growth hormone deficiency in simple terms?

It is a condition in which the pituitary gland, a small gland at the base of the brain, does not make enough growth hormone. In children this mainly causes slow growth and short stature; in adults it more often causes fatigue, reduced muscle strength, and increased body fat. It can be present from birth or develop later, and it is confirmed through specialized hormone testing rather than a single blood test.

Can growth hormone deficiency heal on its own?

In most cases, no — the condition does not simply go away, especially when the pituitary gland has been damaged by a tumor, surgery, or radiation. However, some children diagnosed with idiopathic (no identified cause) deficiency are found to have normal growth hormone levels when retested after puberty. Because of this possibility, doctors usually retest young adults before deciding whether lifelong therapy is needed.

How serious is growth hormone deficiency?

It is a significant medical condition, but it is generally not life-threatening on its own and it responds well to treatment in many cases. Untreated, it can lead to very short adult height in children and, in adults, to reduced bone density, unfavorable cholesterol changes, and diminished quality of life. When it occurs together with deficiencies of other pituitary hormones — particularly cortisol — careful medical management becomes more urgent.

What are the first growth hormone deficiency symptoms parents notice?

The most common early sign is that a child grows more slowly than classmates or siblings and gradually falls behind on the growth chart, often while keeping normal body proportions and a somewhat younger-looking face. Delayed tooth development and a slightly chubby build can be additional clues. In newborns, episodes of low blood sugar may be an early sign. Any persistent change in a child’s growth pattern is worth discussing with a pediatrician.

How is growth hormone deficiency diagnosed?

Doctors start by tracking growth over time and running blood tests, including IGF-1, a marker that reflects growth hormone activity. If results are concerning, the diagnosis is confirmed with growth hormone stimulation tests, in which medication is used to trigger hormone release and blood levels are measured over several hours. An MRI of the brain is usually performed to examine the pituitary gland, and a bone age X-ray helps assess a child’s remaining growth potential.

How long does growth hormone deficiency treatment last?

In children, treatment usually continues until growth is complete, typically through the end of puberty, which may mean many years of daily or weekly injections. After growth finishes, doctors often retest hormone levels; if the deficiency persists, adult-dose treatment may be recommended to protect bone, muscle, and metabolic health. The exact duration is individual and is reviewed regularly by the endocrinology team.

Will my child reach a normal height with treatment?

Many children who start treatment early and take it consistently reach an adult height within or near the range expected from their family background, but no doctor can guarantee a specific result. The response depends on the age at which treatment begins, the severity of the deficiency, adherence to injections, and individual biology. Regular follow-up allows the care team to adjust doses and give realistic, updated expectations over time.

When to see a doctor

Consider arranging a medical evaluation if you notice any of the following in your child or yourself:

• A child growing noticeably more slowly than peers, or falling across percentile lines on the growth chart.
• A child who is much shorter than expected for the family, especially with a younger-looking face or delayed tooth development.
• Puberty that has not started by around age 13 in girls or 14 in boys, or that stalls after starting.
• Persistent unexplained fatigue, muscle weakness, or weight gain in an adult with a history of pituitary tumor, brain surgery, cranial radiation, or serious head injury.

Seek urgent medical care if any of these red-flag warning signs occur, as they may indicate a pituitary or brain problem, or a dangerous shortage of other hormones:

• Severe or worsening headaches, especially with vision changes such as blurred or double vision or loss of side vision.
• Repeated vomiting with headache, confusion, or unusual drowsiness.
• Signs of severe low blood sugar — shakiness, sweating, confusion, fainting, or, in an infant, poor feeding, floppiness, or seizures.
• Sudden collapse, extreme weakness, dizziness, or vomiting in someone known to have pituitary hormone deficiencies, which may signal a cortisol crisis (adrenal crisis) — a medical emergency.
• Excessive thirst and very frequent urination developing rapidly, which can indicate another pituitary-related problem.

Growth hormone deficiency is a manageable condition when it is recognized and treated appropriately. If growth or hormone-related symptoms concern you, a doctor can determine whether testing is needed and guide you through the next steps.