Causes of Growth Hormone Deficiency in Adults

When most people hear about growth hormone deficiency (GHD), they think of kids who aren’t growing normally. But adults can have it too. In grown-ups, low levels of growth hormone can affect energy, body weight, muscle, mood, and overall health. To understand how doctors treat it, it’s important to know what causes it.

Pituitary Tumors and Treatment

The most common reason adults develop GHD is damage to the pituitary gland, a small organ at the base of the brain. Tumors like pituitary adenomas or craniopharyngiomas can affect how it works. Treatments for these tumors such as surgery or radiation can also lower or stop growth hormone production.

Head Injuries and Blood Flow Problems

A strong hit to the head can sometimes damage the pituitary gland or the hypothalamus (the area that controls it), leading to hormone problems. Blood flow issues can also play a role. For example:

• Pituitary apoplexy: sudden bleeding into the gland.
  
• Sheehan’s syndrome: pituitary damage that can happen after heavy bleeding during childbirth.

Both can cause long-lasting hormone deficiencies.

Infections and Inflammation

Certain illnesses can damage the pituitary through swelling or inflammation. Diseases such as sarcoidosis, autoimmune hypophysitis, or tuberculosis (TB) are less common but still important to know about when diagnosing GHD.

Radiation Therapy

Radiation to the brain is often used to treat cancer which can also harm the pituitary. In fact, growth hormone is usually the first hormone affected after radiation, making this a well-known cause of adult GHD.

Genetic and Birth-Related Conditions

Some people are born with conditions that affect hormone production, such as Turner syndrome, Prader-Willi syndrome, or gene mutations. While many are found in childhood, some cases last into adulthood or are only discovered later in life.

Hypothalamic Damage

The hypothalamus regulates the timing of growth hormone release from the pituitary gland, so any injury to it, whether caused by tumors, surgery, trauma, or radiation can interfere with hormone signals and result in a deficiency.

Idiopathic (Unknown Cause)

In rare cases, adults develop GHD without a clear reason. These are called idiopathic cases. Even with advanced tests, doctors sometimes can’t find the exact cause. What matters most is focusing on treatment to improve health and well-being.

Why Identifying the Cause Matters

Knowing why someone has GHD helps doctors create the best treatment plan. For example, a patient who had pituitary surgery may need long-term checkups, while someone with an autoimmune condition might need broader testing. Identifying the cause ensures safe and effective treatment

MetroMed’s Approach

At MetroMed, we know that every patient’s story is different. Whether the cause is a tumor, past treatments, trauma, or another condition, we carefully study your health history to find the root problem. From there, we build a treatment plan that fits your needs and helps restore balance. Our goal is to support you every step of the way so you can feel your best.