Is your child growing taller too fast? Discover what you need to know about gigantism.

Sometimes you might notice your child is growing much faster than other kids their age. While growth spurts are normal, sudden and extreme height gains combined with large hands and feet can sometimes point to a rare medical condition. Today we are going to look closely at a condition known as gigantism.

Understanding this condition helps you spot early warning signs and seek expert advice when needed. Let us explore what gigantism means, why it happens, and how doctors diagnose and treat it.

What is Gigantism?

Simply put, gigantism is a rare condition where a child or young person makes way too much growth hormone in their body. This excess hormone causes them to grow much taller than other children of the same age and gender.

Normally, your brain has a tiny gland called the pituitary gland that makes this growth hormone. If a small growth or tumor forms inside this gland, it can pump out far more hormone than your body needs. That extra hormone leads directly to gigantism.

The pituitary gland sits right at the base of your brain, just below another part called the hypothalamus. This tiny gland actually releases around eight different hormones, and growth hormone is just one of them.

Growth hormone, sometimes called human growth hormone, is essential for a child's normal development. It affects many parts of the body to keep growth on track. However, your bones have special areas near their ends called growth plates. Once these growth plates close up fully after puberty, growth hormone can no longer make you grow taller.

After growth plates close, growth hormone instead helps maintain your bones, cartilage, and other tissues while keeping your metabolism steady. Growth hormone also works closely with another hormone made by your liver called insulin-like growth factor 1, or IGF-1. Together, these two substances guide your body's normal growth and metabolism.

In gigantism, having too much growth hormone makes muscles, bones, and connective tissues grow much too fast. This causes unusual height gains and several changes in soft tissues throughout the body. Without proper medical treatment, some children with gigantism can grow well over eight feet tall.

Because of this rapid and extreme growth, catching gigantism early and starting medical care right away is extremely important.

Difference Between Gigantism and Acromegaly.

Both gigantism and acromegaly happen when your body produces too much growth hormone. The main difference is simply who gets the condition and when it develops.

Acromegaly affects adults whose growth plates have already closed. Gigantism affects children and young people who are still growing and have not yet gone through puberty.

In simple terms, if your growth plates are still open before puberty ends and your growth hormone levels spike, you develop gigantism. This causes massive increases in height because the long bones in your arms and legs are still able to grow longer.

If your growth hormone increases after your growth plates close for good, you develop acromegaly instead. In acromegaly, you do not grow taller, but the extra growth hormone changes the shape of your facial bones, hand sizes, and organ sizes over time.

Compared to acromegaly, gigantism is a much rarer medical condition.

Who Gets Gigantism and How Common Is It?

Even though it is extremely rare, any child whose bone growth plates are still open can develop gigantism. Doctors see this condition more often in boys than in girls, though it can affect any child.

Gigantism is truly very rare in the real world. For instance, only a small number of active cases are typically reported across the United States at any given time. This shows just how unusual it is to encounter.

How Normal Child Growth Works Versus Gigantism.

Growth hormone controls how a child develops throughout their childhood years. It directs the steady growth of bones and tissues while regulating metabolism. Normally, a child's growth stays steady and predictable until they reach puberty.

When puberty begins, sex hormones like estrogen and testosterone increase greatly. These hormones slowly cause the growth plates at the ends of your long bones to close up. Once your growth plates close completely, your height growth stops for good.

How fast a child grows and how tall they will be as an adult depends on several inherited genes from parents, environmental factors, and their biological sex.

When a child has gigantism, they grow much faster and taller than other children of the same age and sex. However, early signs of gigantism can sometimes look like a normal childhood growth spurt, making it hard for parents to notice right away.

If you have any questions or worries about how fast your child is growing, always talk to your doctor.

Symptoms of Gigantism.

Having too much growth hormone causes the core physical symptoms of gigantism. Also, a tumor in the pituitary gland can press against nearby brain tissues and nerves, leading to other symptoms.

The most obvious sign of gigantism is rapid and excessive height growth. Children with gigantism shoot up in height much faster than their peers.

Besides growing much taller and larger than expected for their age, physical signs of gigantism include:

• A very prominent forehead and a jaw that sticks out forward.
• Noticeable gaps between the teeth.
• Thickening facial features over time.
• Unusually large hands and feet with thick fingers and toes.

Other common symptoms you might notice include:

• Enlarged internal organs, especially the heart.
• Heavy sweating, known medically as hyperhidrosis.
• Double vision or trouble seeing things out of the sides of your eyes.
• Frequent headaches.
• Joint pain in the hips, knees, or ankles.
• Delayed puberty.
• Irregular menstrual periods in teenage girls.
• Sleep problems, such as sleep apnea where breathing stops briefly during sleep.
• Muscle weakness throughout the body.

If your child shows any of these signs, talking to a doctor right away is very important.

Causes of Gigantism.

Gigantism is most often caused by a noncancerous tumor in a child's pituitary gland called a pituitary adenoma. This benign tumor releases large amounts of excess growth hormone into the bloodstream. When doctors diagnose gigantism, children almost always have a large pituitary tumor known as a macroadenoma, which measures 10 millimeters or more across. Enlargement of the pituitary gland, called pituitary hyperplasia, can also cause gigantism.

Many children with gigantism carry a genetic mutation linked to pituitary tumors. The most common genetic change associated with gigantism involves the AIP gene. About 29 percent of people with gigantism are affected by this genetic factor.

Sometimes gigantism occurs as part of rare genetic syndromes that increase the risk of developing growth-hormone-producing pituitary tumors. These genetic conditions include:

• Carney complex: This genetic condition affects skin coloring and causes noncancerous tumors in the skin, heart, and endocrine system. About 10% to 13% of people with Carney complex develop growth hormone-producing pituitary tumors that usually grow slowly.
• McCune-Albright syndrome: This condition affects bones, skin, and hormone systems. It causes light brown skin spots, scar-like areas in bones, and early puberty. Around 20% to 30% of people with McCune-Albright syndrome have excess growth hormone due to pituitary gland enlargement or tumors.
• Multiple Endocrine Neoplasias types 1 or 4: These are inherited conditions where one or more of your hormone-producing glands become overactive or form tumors, which can include growth hormone pituitary tumors.
• Neurofibromatosis: This group of genetic disorders affects your skin and nervous system due to abnormal cell growth, sometimes leading to tumors including growth hormone-producing growths.
• Familial Isolated Pituitary Adenomas: This is an inherited condition that causes pituitary adenomas to run in families, including those that secrete excess growth hormone.

How Doctors Diagnose Gigantism.

Because gigantism is very rare and children grow at different rates due to genetics and lifestyle, diagnosing the condition can be challenging.

Doctors usually suspect gigantism when a child's height is more than three standard deviations above the average for their age and sex, or more than two standard deviations above the target height calculated from their parents' heights.

If your doctor suspects gigantism, they will likely refer you to an endocrinologist, who is a specialist in hormone disorders. The specialist will review your child's medical history, family health background, perform a thorough physical exam, and order blood tests and imaging scans to confirm a diagnosis.

Tests Used to Identify Gigantism.

If your child's doctor suspects gigantism, they may order several tests to confirm the condition:

• Growth Hormone and IGF-1 Blood Tests: These tests measure the levels of specific hormones in a sample of your child's blood. Abnormally high levels strongly point toward gigantism.
• Glucose Tolerance Test: This test checks how your child's growth hormone levels respond to sugar. After your child drinks a special sugary liquid, a nurse takes blood samples at regular intervals to see if growth hormone levels drop as they should.
• Imaging Scans: If blood tests confirm gigantism, the doctor will likely recommend an MRI scan or a CT scan. These scans provide clear pictures of the pituitary tumor's size and location, helping doctors plan the best treatment approach.

If gigantism is confirmed, your doctor may order additional tests to check if the extra hormone has affected other parts of the body, such as:

• An echocardiogram to check heart health and function.
• Sleep study tests to check for sleep apnea.
• X-rays or a DEXA scan to check bone density and strength.

Treatments for Gigantism.

The main goals of treating gigantism include:

• Safely lowering growth hormone and IGF-1 levels back to normal.
• Controlling or stopping the growth of the pituitary tumor.
• Relieving pressure that the tumor places on nearby brain tissue and optic nerves.
• Treating or reducing any other health problems caused by excess growth hormone.

Doctors usually use a combination of treatments for gigantism, with surgery and radiation therapy being the most common approaches.

While effective medicine options exist for treating excess growth hormone in adults with acromegaly, researchers have not studied these drugs as thoroughly in children.

Surgery for Gigantism.

Surgery is the most common treatment for gigantism. The main goal is to remove the pituitary tumor or shrink it as much as possible. Because pituitary tumors linked to gigantism are often large, a child may need more than one surgery to successfully control their hormone levels.

The surgeon often performs a procedure called transsphenoidal surgery. In this technique, the surgeon operates through your child's nose and through the sphenoid sinus, which is a hollow space in the skull located behind the nasal passages and beneath the brain.

Radiation Therapy for Gigantism.

If surgery cannot lower growth hormone levels enough on its own, radiation therapy can help. This treatment uses specialized equipment to aim targeted beams of radiation at the tumor. Radiation works slowly, so it may require several treatment sessions spread out over time, and it can take a few years to see full results.

Complications of Treatment.

Following surgery or radiation therapy, about 60 percent of people with gigantism develop hypopituitarism. This condition means the pituitary gland produces fewer hormones than your body needs, or stops making them altogether. Doctors treat hypopituitarism using daily hormone replacement medicines.

Potential complications from pituitary tumor surgery include:

• Bleeding at the surgical site.
• Cerebrospinal fluid leaks from around the brain.
• Meningitis, which is an infection of the membranes covering the brain and spinal cord.
• Imbalances in body salts like sodium and overall water balance.

Side effects of radiation therapy can include:

• Impaired future fertility.
• Vision loss or brain tissue damage in very rare cases.
• The rare chance of developing new secondary tumors years after treatment.

Can Gigantism Be Prevented and What Is the Prognosis?

Unfortunately, there is nothing you can do to prevent gigantism. However, catching the condition early makes a massive difference.

When treatment starts quickly, doctors can slow down or prevent the rapid physical changes caused by excess growth hormone.

The outlook for children and young people diagnosed with gigantism depends on several factors:

• How early or late doctors diagnose the condition.
• How well treatments manage growth hormone levels.
• Whether any complications from gigantism develop over time.

Generally, older teens who are diagnosed later tend to experience more complications than younger children who receive an early diagnosis. This happens because their bodies were exposed to high levels of growth hormone and IGF-1 for a longer period.

Therefore, if you notice any unusual or unexpected changes in your child's growth pattern or physical appearance, talking to their doctor as soon as possible is essential.

Life Expectancy and Long-Term Complications of Gigantism.

Catching gigantism early and getting prompt treatment is vital for protecting overall health, avoiding extreme height-related issues, and maintaining a normal life expectancy.

If left untreated, gigantism connects to significant health complications, and death rates can be up to twice as high as normal.

Long-term complications that some people with untreated gigantism experience due to excess growth hormone and extreme height include:

• Trouble moving around easily due to muscle weakness.
• Osteoarthritis and joint degeneration.
• Peripheral neuropathy affecting nerve function.
• Sleep apnea.
• An enlarged heart, known as cardiomegaly, and heart valve issues.
• Metabolic problems such as type 2 diabetes.

also, daily challenges like finding clothes that fit or navigating travel can affect the quality of life for people with untreated gigantism.

When to See a Doctor About Gigantism.

If your child has a confirmed diagnosis of gigantism, they will need regular checkups with their pediatrician and an endocrinologist to monitor treatment progress and ensure hormone levels remain balanced.

If you notice any sudden changes in your child's growth speed or physical traits, talking to their doctor promptly is very important. While gigantism is an unlikely cause, checking out any suspected change is always smart.

Early diagnosis of gigantism leads to the best possible results, and children who receive timely care often go on to live healthy lives. If you have any questions about your child's growth, never be afraid to ask your doctor for guidance.

Remember that early diagnosis and prompt treatment give your child the best chance to grow up healthy and live a normal life. Do not worry. Doctors are here to support you and your child every step of the way. Feel free to talk through any questions you have with them.