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Growth Hormone Deficiency – Causes, Symptoms & Treatment
Growth hormone deficiency occurs when the pituitary gland does not produce enough growth hormone (somatotropin). It can cause growth disorders in children and metabolic problems in adults.
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Growth hormone deficiency occurs when the pituitary gland does not produce enough growth hormone (somatotropin). It can cause growth disorders in children and metabolic problems in adults.
What is Growth Hormone Deficiency?
Growth hormone deficiency (GHD) is a medical condition in which the pituitary gland fails to produce sufficient amounts of growth hormone (somatotropin, GH). Growth hormone plays a key role in physical growth, metabolism, and the regulation of muscle and fat tissue. The deficiency can occur in childhood or adulthood, with different clinical implications in each group.
Causes
Growth hormone deficiency can result from a variety of causes:
- Congenital causes: Genetic defects or structural abnormalities of the pituitary gland or hypothalamus
- Acquired causes: Tumors in the pituitary region (e.g., craniopharyngioma), cranial radiation therapy, traumatic brain injury, inflammation, or autoimmune conditions
- Idiopathic GHD: In many cases, especially in children, no clear underlying cause can be identified
- Transient deficiency: Severe psychosocial stress or malnutrition can temporarily suppress growth hormone production
Symptoms
In Children
- Significantly slowed growth rate and short stature
- Delayed bone age
- Delayed puberty
- Increased fat accumulation in the abdominal area
- Low blood sugar (hypoglycemia), particularly in newborns
In Adults
- Increased body fat, particularly around the abdomen
- Reduced muscle mass and muscle weakness
- Elevated risk of cardiovascular disease
- Reduced bone density (increased risk of osteoporosis)
- Decreased physical capacity and chronic fatigue
- Psychological symptoms such as low motivation and depressive mood
Diagnosis
Diagnosing growth hormone deficiency requires a combination of clinical assessment, laboratory testing, and imaging:
- Growth chart analysis: In children, height is monitored regularly and compared to standard growth curves
- Stimulation tests: Because GH secretion is pulsatile, single blood measurements are not reliable. Stimulation tests (e.g., insulin tolerance test, arginine test, or GHRH-arginine test) provoke GH release and measure the peak pituitary response
- IGF-1 levels: Insulin-like growth factor 1 (IGF-1) in the blood serves as an indirect marker of growth hormone activity
- Bone age assessment: An X-ray of the hand is used in children to evaluate skeletal maturity
- MRI of the pituitary gland: Imaging is used to detect tumors, malformations, or structural changes in the pituitary gland
Treatment
The standard treatment for growth hormone deficiency is replacement therapy with recombinant human growth hormone (rhGH), administered daily as a subcutaneous injection (under the skin).
In Children
The goal of treatment is to normalize growth and help the child reach an adult height within the normal range. Therapy is initiated as early as possible and is generally continued until growth plate closure signals the end of linear growth.
In Adults
Treatment aims to improve body composition, bone density, physical performance, and overall quality of life. Dosages are typically lower in adults than in children and are adjusted individually based on response and tolerance.
Side Effects of Therapy
- Fluid retention (edema)
- Joint and muscle pain
- Headaches
- Rarely: elevated blood sugar levels
Therapy is carried out under regular endocrinological supervision to monitor effectiveness and tolerability.
References
- Mehta A, Dattani MT. Developmental disorders of the hypothalamus and pituitary gland associated with congenital hypopituitarism. Best Practice & Research Clinical Endocrinology & Metabolism. 2008;22(1):191-206.
- Growth Hormone Research Society. Consensus guidelines for the diagnosis and treatment of growth hormone (GH) deficiency in childhood and adolescence. Journal of Clinical Endocrinology & Metabolism. 2000;85(11):3990-3993.
- Molitch ME et al. Evaluation and Treatment of Adult Growth Hormone Deficiency: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism. 2011;96(6):1587-1609.
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