Growth Hormone Deficiency: Symptoms, Diagnosis & Treatment

What Is Growth Hormone Deficiency?

Growth hormone deficiency (GHD) occurs when the pituitary gland doesn't produce enough growth hormone, or the hormone doesn't work properly, so a child's height doesn't grow at a normal pace. Growth hormone is the key hormone that stimulates cartilage cells at the growth plates of the bones, so when it's lacking, growth slows down and the child ends up shorter than peers.

Growth hormone deficiency generally falls into two categories, depending on the cause.

• Congenital: The pituitary gland's development or function is affected from birth.
• Acquired: Pituitary function declines due to brain injury, a tumor, radiation therapy, infection, or another cause. In some cases no clear cause is found, known as idiopathic GHD.

Growth hormone deficiency is just one of several possible causes of short stature. Catching it early and managing it appropriately gives a child the best chance of preserving their growth potential.

Warning Signs and Symptoms of Growth Hormone Deficiency

Growth hormone deficiency doesn't cause any obvious pain, so it's usually suspected based on changes in height and growth rate. If you notice any of the following, it's worth getting checked.

• Noticeably shorter than peers: Height falls below the 3rd percentile on growth charts, or is significantly shorter than the height predicted from the parents' heights.
• Slow growth rate: Growing less than 4 cm per year after age 3, or a growth curve that was tracking well but is gradually drifting downward.
• A younger-looking appearance: A face that looks younger than the child's actual age, a somewhat chubby build, and skeletal development (bone age) that tends to lag behind actual age.
• Delayed puberty: Signs of puberty appearing later than in peers.

These signs can also point to causes other than growth hormone deficiency, so rather than guessing on your own, it's important to track the growth curve over time and consult a specialist.

Short Height Doesn't Always Mean Deficiency

Many parents worry about growth hormone deficiency the moment they notice their child is short, but most short children do not have growth hormone deficiency. In practice, the following normal-variant causes are far more common.

• Familial short stature: The child's predicted height is genetically shorter because the parents are shorter, but the growth rate itself tracks the curve normally.
• Constitutional growth delay: Sometimes called a "late bloomer" pattern — the child is small early on but catches up later as puberty arrives on a delayed timeline.

On the other hand, if a child was growing normally and then growth suddenly stalls, or the growth curve keeps drifting downward, it's worth ruling out growth hormone deficiency, thyroid dysfunction, or other chronic conditions. That's why diagnosis puts more weight on the growth rate and the trend of the curve than on the child's height at a single point in time.

How Is Growth Hormone Deficiency Diagnosed?

Diagnosing growth hormone deficiency isn't a single test — it's a multi-step process that pulls the findings together. A typical diagnostic workup looks like this.

• Step 1 — Growth assessment: Height and weight are plotted on a growth chart to check percentile and growth rate. The trend of this growth curve is the first clue that shapes what testing comes next.
• Step 2 — Bone age test: An X-ray of the hand and wrist shows skeletal maturity (bone age). When bone age lags behind actual age, it helps estimate how much growth potential remains.
• Step 3 — Blood tests: IGF-1 levels, thyroid function, and overall health markers are checked to rule out other causes.
• Step 4 — Growth hormone stimulation test: Because growth hormone is released in pulses, a single blood draw can't capture it reliably. Medication is used to stimulate release, and blood is drawn multiple times to measure the hormone response.

Together, these steps determine whether growth hormone deficiency is present, how significant it is, and whether treatment is warranted.

Treating Growth Hormone Deficiency

Once growth hormone deficiency is diagnosed, growth hormone replacement therapy may be considered to make up for the shortfall. This treatment involves regular administration of growth hormone identical to what the body naturally produces, with the goal of restoring a normal growth rate.

How well treatment works varies from child to child, and depends heavily on the following factors.

• Timing of diagnosis and treatment start: Starting earlier, while the growth plates are still sufficiently open, generally leaves more growth potential to work with.
• Severity and cause of the deficiency: Response can differ depending on how severe the deficiency is and whether other conditions are present.
• Treatment adherence: Staying consistent with the prescribed regimen, and having growth rate and bone age checked regularly so the plan can be adjusted, matters a great deal.

It's important to understand that whether and how to treat is a decision a specialist makes based on test results. Growth treatment isn't a guarantee of a specific height — the goal is to help preserve as much of a child's growth potential as possible. Identifying the cause and acting before the growth plates close is what matters most.

When to See a Doctor

If any of the following applies to your child, it's a good idea to have their growth evaluated. The earlier you check, the more time there is to respond.

• Growing less than 4 cm per year after age 3.
• Falling below the 3rd percentile on the growth chart, or dropping two or more percentile bands within 6–12 months.
• Current height is noticeably shorter than the height predicted from the parents' heights.
• A younger-looking face and somewhat chubby build compared to peers, along with delayed signs of puberty.
• Growth that was on track but has clearly slowed down from some point on.

Because a missed growth window is difficult to make up later, if you notice any concerning signs, it's wiser to check the growth curve and bone age now, while the growth plates are still open, rather than waiting to "see how it goes." This information is for reference only — an accurate diagnosis and treatment plan require consultation with a specialist.