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Overview

What Is Hypopituitarism?

Hypopituitarism occurs when the pituitary gland produces too little of one or more important hormones. The pituitary is a small gland at the base of the brain that helps control other endocrine glands, including the thyroid, adrenal glands and reproductive organs. Low pituitary hormones can affect growth, metabolism, fertility, blood pressure and the body’s response to stress. Hypopituitarism can affect children or adults, and the terms hypopituitarism and hypopituitarism may appear interchangeably in health information.

Symptoms

Hypopituitarism Symptoms

Hypopituitarism symptoms vary depending on which hormone is deficient and how severe the deficiency is. Symptoms may develop slowly and can be difficult to recognize because they overlap with many other conditions. They may become more noticeable after an illness, injury or childbirth.

  • Fatigue may persist even after adequate rest.
  • Weakness can affect everyday activities.
  • Low blood pressure may cause lightheadedness or fainting.
  • Unexplained weight gain or weight loss may occur.
  • Sensitivity to cold can develop when thyroid-stimulating hormone is low.
  • Reduced appetite may occur.
  • Headaches may be persistent or recurring.
  • Vision changes can occur if a nearby mass affects the optic nerves.
  • Menstrual changes may include irregular or absent periods.
  • Reduced sex drive may occur in adults.
  • Erectile dysfunction may affect some men.
  • Infertility may result from reduced reproductive hormones.
  • Slowed growth may occur in children.
  • Delayed puberty may occur in children or teenagers.

Causes

Causes of Hypopituitarism

The pituitary gland and hypothalamus work together to send signals that control hormone production and release. A problem in either area can interrupt these signals and reduce the hormones made by the pituitary or the glands it controls.

  • Pituitary or nearby tumors can damage hormone-producing tissue or interfere with its signals.
  • Surgery or radiation near the pituitary can affect normal gland function.
  • Traumatic brain injury can injure the pituitary or hypothalamus.
  • A stroke or bleeding near the pituitary can reduce its blood supply.
  • Infections or inflammation can damage the pituitary region.
  • Inherited conditions can affect pituitary development or hormone production.
  • Autoimmune disease can cause the immune system to attack pituitary tissue.
  • Pituitary damage related to pregnancy or childbirth can cause hormone deficiency.

Risk Factors

Risk Factors for Hypopituitarism

Medical and Treatment-Related Risk Factors

  • A history of pituitary disease or a pituitary tumor increases the likelihood of hormone deficiency.
  • Previous brain surgery can affect the pituitary or nearby structures.
  • Head or neck radiation may injure pituitary tissue over time.
  • A previous traumatic brain injury can damage pituitary function.
  • Stroke or bleeding near the brain can disrupt pituitary blood flow.
  • Autoimmune disease may increase the risk of pituitary inflammation or damage.
  • Inherited or genetic conditions can affect pituitary development and hormone production.
  • Pregnancy-related pituitary injury can cause deficiency after childbirth.
  • Most risk factors for hypopituitarism are medical, inherited or treatment-related rather than lifestyle-related or preventable.

Complications

Complications of Hypopituitarism

Complications depend on which hormone is missing and how long the deficiency remains untreated. Regular treatment and follow-up can reduce these risks, but some deficiencies require urgent attention.

  • Adrenal crisis can cause a life-threatening lack of cortisol during severe stress.
  • Low blood pressure may cause dizziness, fainting or shock.
  • Low blood sodium can lead to confusion, seizures or other serious problems.
  • Osteoporosis can make bones weaker and increase the risk of fractures.
  • Anemia can contribute to tiredness and weakness.
  • Infertility may result from inadequate reproductive hormones.
  • Delayed or abnormal growth may occur in children.
  • Cardiovascular risk may increase when hormone deficiencies are untreated.
  • Reduced quality of life may result from persistent symptoms and treatment challenges.

Diagnosis

How Hypopituitarism Is Diagnosed

Diagnosis involves a medical history, physical examination and targeted testing because hypopituitarism symptoms can overlap with many other conditions. Clinicians assess which pituitary hormones and target-gland hormones may be low, then investigate the possible cause.

  • Blood tests measure pituitary hormones and hormones made by target glands such as the thyroid and adrenal glands.
  • Stimulation or suppression tests may show how the pituitary and adrenal glands respond when needed.
  • Magnetic resonance imaging of the pituitary can identify tumors or structural changes.
  • Vision testing may be needed when a mass could affect the optic nerves.
  • Additional tests may be guided by the suspected cause, medical history and examination findings.

Treatment & Management

Treatment and Management of Hypopituitarism

Hormone Replacement

Treatment is individualized according to the hormones that are deficient. It may include corticosteroids, thyroid hormone, sex hormones or growth hormone, as well as medicines that help manage water balance when clinically indicated. Treatment may also address the underlying cause, such as monitoring or treating a tumor, surgery, radiation or management of inflammation when appropriate.

Long-Term Management

Outlook and Prognosis

Outlook and Prognosis

The long-term outlook depends on the cause of hypopituitarism, the hormones affected and the response to treatment. Some people need lifelong hormone replacement, while others may recover some pituitary function after the underlying cause is treated. With appropriate replacement and monitoring, hypopituitarism is often manageable, although hormone needs can change over time.

When Should You See a Doctor

When Should You See a Doctor?

Arrange a medical appointment for persistent unexplained fatigue, menstrual or sexual changes, slowed growth, headaches or vision changes. Evaluation is also important after pituitary surgery, a significant head injury or radiation near the brain or neck. A clinician can determine whether hormone testing or other assessment is appropriate.

Seek urgent help

Possible adrenal crisis

Seek emergency care for severe weakness, confusion, fainting, vomiting, severe abdominal pain, very low blood pressure, inability to keep steroid medicine down or rapidly worsening illness in someone with adrenal insufficiency. Follow the prescribed emergency steroid plan and seek immediate medical help.

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