Art

HOOK

The body's response to stress depends on a delicate balance of hormones. ACTH deficiency occurs when the pituitary gland does not produce enough adrenocorticotropic hormone (ACTH), resulting in reduced cortisol production by the adrenal glands. Without timely diagnosis and treatment, cortisol deficiency can become a serious medical condition.

HISTORY / OVERVIEW

Adrenocorticotropic hormone deficiency is a form of secondary adrenal insufficiency. ACTH is produced by the pituitary gland and stimulates the adrenal glands to produce cortisol, a hormone essential for regulating metabolism, blood pressure, immune function, and the body's response to physical and emotional stress.

ACTH deficiency may occur alone (isolated ACTH deficiency) or as part of broader pituitary hormone deficiencies.

CAUSES

Common causes include:

• Pituitary tumors

• Pituitary surgery or radiation therapy

• Autoimmune disorders affecting the pituitary gland

• Traumatic brain injury

• Genetic conditions

• Infections affecting the pituitary or hypothalamus

• Certain medications that suppress the hypothalamic-pituitary-adrenal (HPA) axis

• Rare congenital disorders

COMMON SIGNS & SYMPTOMS

Symptoms often develop gradually and may include:

• Persistent fatigue

• Weakness

• Loss of appetite

• Unintentional weight loss

• Nausea or vomiting

• Dizziness, especially when standing

• Low blood pressure

• Low blood sugar (particularly in children)

• Difficulty coping with physical stress or illness

Unlike primary adrenal insufficiency, ACTH deficiency typically does not cause significant skin darkening (hyperpigmentation) because ACTH levels are low rather than elevated.

DIAGNOSIS

Healthcare providers may evaluate ACTH deficiency using:

• Medical history and physical examination

• Morning blood cortisol measurement

• Blood ACTH level

• Dynamic stimulation tests (such as the ACTH stimulation test or other endocrine testing, depending on the clinical situation)

• Pituitary hormone evaluation

• MRI of the pituitary gland when indicated

TREATMENT

Treatment focuses on replacing the missing cortisol and addressing the underlying cause when possible.

Common approaches include:

• Glucocorticoid replacement therapy

• Adjustment of medication doses during illness, surgery, or significant physical stress under medical guidance

• Treatment of pituitary tumors or other underlying conditions when appropriate

• Ongoing follow-up with an endocrinologist

People with adrenal insufficiency are often advised to carry medical identification and have an emergency plan in case of adrenal crisis.

POSSIBLE COMPLICATIONS

Without appropriate treatment, ACTH deficiency can lead to:

• Severe cortisol deficiency

• Adrenal crisis (a medical emergency)

• Low blood pressure and shock

• Severe hypoglycemia

• Electrolyte disturbances (less prominent than in primary adrenal insufficiency)

• Reduced quality of life

LIVING WITH ACTH DEFICIENCY

✔ Take prescribed glucocorticoid medication exactly as directed.✔ Learn "sick day rules" for adjusting medication during illness or surgery under medical supervision.✔ Attend regular endocrine follow-up appointments.✔ Wear a medical alert bracelet or carry an emergency medical card.✔ Seek urgent medical care for severe vomiting, collapse, confusion, or inability to take oral medication, as these may indicate an adrenal crisis.

FUTURE DEVELOPMENTS

Research continues in:

• Improved physiological cortisol replacement therapies

• Long-acting glucocorticoid formulations

• Earlier diagnosis through advanced endocrine testing

• Better understanding of pituitary disorders

• Personalized hormone replacement strategies

ENGAGEMENT QUESTION

Which advancement do you think could have the greatest impact on managing ACTH deficiency: earlier diagnosis, improved hormone replacement therapies, wearable health monitoring, or personalized endocrine treatment plans?