Many parents worry when a child is much shorter than classmates or seems to have stopped growing. But doctors stress that growth hormone deficiency is only one of several causes of short stature, and most short children do not have it. The hormone is made in the pituitary gland, helps produce IGF-1, and supports bone growth, muscle mass, metabolism, and the balance between fat and muscle.
Pediatricians advise tracking growth charts over time and seeking evaluation if a child is below the 3rd percentile, falls across percentiles, grows much more slowly, has delayed puberty, or is notably shorter than expected from parental height. Other possible causes include family genetics, constitutional delay, chronic illness, nutritional disorders, genetic syndromes, thyroid problems, and other medical conditions.
Diagnosis cannot be made with a routine blood test because the hormone is secreted in pulses. Instead, doctors use special stimulation tests with hormone-triggering substances and check levels at several time points. If two different stimulation tests show deficiency, the child is usually sent for a brain MRI to assess the pituitary gland.
Treatment is given only for specific indications, including confirmed growth hormone deficiency, children born small for gestational age who did not catch up, Turner syndrome, Prader-Willi syndrome, Noonan syndrome, chronic kidney failure, and some cases of severe unexplained short stature. The hormone is manufactured by genetic engineering and is nearly identical to the natural hormone. It was traditionally given as a daily evening injection, but newer once-weekly preparations are now used in some indications and appear similarly effective.
Response is often seen in the first one to two years, with growth rates sometimes doubling or quadrupling. The best results are in younger children, those with marked deficiency, and those who start early. Final height gains vary widely, from about 10 to 20 centimeters in children with severe deficiency, to an average of about 4 to 5 centimeters in other cases. Side effects are uncommon but can include headache, dizziness, vision changes, edema, leg pain, injection-site irritation, and, very rarely, increased intracranial pressure. Children on treatment need regular follow-up with a pediatric endocrinologist.
