Growth hormone deficiency
What is Growth hormone deficiency?
Growth hormone deficiency is a condition where your pituitary gland does not make enough growth hormone. The pituitary is a small gland at the base of your brain that controls many important body functions. Growth hormone helps children grow taller and helps adults maintain healthy muscle, bone, and fat levels.
In children, this deficiency can slow down growth and delay puberty. In adults, it can cause fatigue, weight gain, reduced muscle mass, and changes in cholesterol levels. The condition can be present from birth or develop later in life due to injury or disease.
Growth hormone works closely with other substances in your body, including insulin-like growth factor-1 and its binding proteins. These proteins carry growth factors through your bloodstream and help regulate how your body grows and uses energy. When growth hormone levels drop, these related proteins often decrease as well.
Symptoms
- Slow growth rate in children, falling below growth charts
- Short stature compared to peers of the same age
- Delayed puberty in teenagers
- Fatigue and low energy levels
- Increased body fat, especially around the waist
- Reduced muscle mass and strength
- Decreased bone density
- Changes in cholesterol levels
- Reduced exercise capacity
- Mood changes including anxiety or depression
Some adults with mild growth hormone deficiency may have subtle symptoms that develop slowly over time. Children with this condition typically show more obvious signs like slower growth compared to their classmates.
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Causes and risk factors
Growth hormone deficiency can be congenital, meaning present from birth, or acquired later in life. Congenital causes include genetic mutations, problems with pituitary gland development, or structural brain abnormalities. Some children are born with an underdeveloped or damaged pituitary gland that cannot produce enough growth hormone.
Acquired growth hormone deficiency can result from head injuries, brain tumors, radiation therapy to the brain, infections like meningitis, or surgery affecting the pituitary gland. In many adult cases, the cause remains unknown. Risk factors include a history of brain surgery, radiation treatment for childhood cancer, and autoimmune conditions affecting the pituitary gland. Rarely, severe malnutrition or chronic stress can also impact growth hormone production.
How it's diagnosed
Diagnosing growth hormone deficiency requires specialized testing by an endocrinologist, a doctor who treats hormone disorders. The process typically includes measuring height and growth rate in children, reviewing medical history, and performing blood tests. Because growth hormone levels fluctuate throughout the day, a single blood test is not enough to confirm the diagnosis.
Doctors often use stimulation tests where they give you a substance that normally triggers growth hormone release, then measure your response. Blood tests may also check IGF Binding Protein-3, a protein that helps indicate growth hormone activity in your body. Other tests can include bone age X-rays, MRI scans of the brain to examine the pituitary gland, and tests of other pituitary hormones. Talk to your doctor about specialized testing if you or your child shows signs of growth hormone deficiency.
Treatment options
- Daily growth hormone injections prescribed and monitored by an endocrinologist
- Regular follow-up appointments to track growth and adjust dosing
- Adequate sleep, as growth hormone is naturally released during deep sleep
- Balanced nutrition with enough protein to support growth and muscle development
- Regular exercise, especially resistance training to build muscle mass
- Weight management to reduce excess body fat
- Treatment of underlying conditions affecting the pituitary gland
- Monitoring bone density and heart health during treatment
Frequently asked questions
In children, growth hormone deficiency primarily affects height and physical development, causing slower growth rates and delayed puberty. In adults, the condition affects body composition, energy levels, and metabolism rather than height. Adults may experience increased body fat, reduced muscle mass, fatigue, and changes in cholesterol levels. Both age groups need hormone replacement therapy, but the goals differ based on developmental stage.
Growth hormone deficiency is typically a lifelong condition that requires ongoing treatment rather than a cure. Daily growth hormone injections can replace the missing hormone and improve symptoms. Some children who receive treatment may produce adequate growth hormone as adults and can stop therapy. However, many people need to continue treatment throughout their lives to maintain healthy metabolism and body composition.
Being naturally short means you are growing at a normal rate but will reach a shorter adult height based on genetics. Growth hormone deficiency causes an abnormally slow growth rate, with children falling further behind their peers over time. Children with the deficiency often grow less than 2 inches per year, while healthy children typically grow 2 to 3 inches annually. Blood tests and growth charts help doctors distinguish between the two conditions.
Diagnosing growth hormone deficiency requires specialized stimulation tests where doctors measure your growth hormone levels after giving you a substance that triggers release. Doctors also check IGF Binding Protein-3, which reflects growth hormone activity over time. Additional tests may measure insulin-like growth factor-1 and other pituitary hormones. Single random growth hormone tests are not reliable because levels naturally fluctuate throughout the day.
Growth hormone therapy is generally safe when prescribed and monitored by an endocrinologist for true deficiency. Common side effects include joint pain, fluid retention, and increased blood sugar levels. Rare risks include increased pressure in the brain and worsening of scoliosis in children. Regular monitoring through blood tests and physical exams helps doctors adjust doses and catch any problems early. The therapy should never be used without medical supervision or for non-medical purposes.
Lifestyle changes cannot replace missing growth hormone but can support treatment effectiveness. Getting enough deep sleep is important because your body naturally releases growth hormone during sleep. Regular exercise, especially resistance training, helps build muscle mass. Eating adequate protein and maintaining a healthy weight also support treatment outcomes. However, growth hormone injections remain the primary treatment for diagnosed deficiency.
Untreated growth hormone deficiency in children leads to significantly shorter adult height and delayed development. In adults, untreated deficiency can cause progressive muscle loss, increased body fat, reduced bone density leading to fractures, and poor heart health. Many people experience reduced quality of life due to fatigue and mood changes. Early diagnosis and treatment can prevent most of these long-term complications.
Children typically continue growth hormone therapy until they reach their final adult height and their growth plates close. This can take several years depending on when treatment starts. Adults with growth hormone deficiency often need lifelong treatment to maintain healthy metabolism and body composition. Your endocrinologist will regularly assess whether you still need treatment based on symptoms and blood test results.
Yes, adults can develop growth hormone deficiency after head injuries, brain surgery, radiation therapy, or from pituitary tumors. The condition can also develop gradually due to autoimmune problems or other diseases affecting the pituitary gland. In many cases, doctors cannot identify a specific cause. Adults who develop this deficiency may notice gradual changes in energy, body composition, and overall health over months or years.
Insurance coverage for growth hormone therapy varies by plan and requires documented medical necessity. Most insurance companies cover treatment for children with proven growth hormone deficiency and growth failure. Adult coverage can be more challenging and typically requires evidence of pituitary disease or severe deficiency. Your endocrinologist can help provide the documentation needed for insurance approval. Treatment costs can be significant without coverage.