Addison's Disease vs Cushing Syndrome, carbohydrates and Psychological Symptoms

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  1. Both Addisons disease and Cushing’s syndrome involves the adrenal glands but represent opposite ends of the cortisol spectrum.

    1. Adrenal Gland Involvement

  2. Addison’s Disease (Adrenal Insufficiency):

    • Characterized by underproduction of cortisol (and often aldosterone).

    • Common causes include autoimmune destruction, infections (e.g., tuberculosis), or genetic disorders.

    • Primary adrenal insufficiency may also cause hypercalcaemia, likely due to volume depletion and reduced renal calcium excretion.

  3. Cushing’s Syndrome:

    • Defined by overproduction of cortisol.

    • Causes include pituitary tumors (Cushing’s disease), adrenal tumors, or prolonged use of corticosteroids (iatrogenic Cushing’s).

2. Hormonal Imbalance and Physical Manifestations

Feature

Addison’s Disease

Cushing’s Syndrome

Cortisol Levels

Low

High

Aldosterone

Often low

Normal or suppressed

Weight Changes

Weight loss

Weight gain (especially central obesity)

Blood Pressure

Low (hypotension)

High (hypertension)

Skin Changes

Hyperpigmentation

Thin skin, easy bruising, purple striae

Electrolyte Changes

Hyponatremia, hyperkalemia

Hypokalemia, hyperglycemia

Treatment

Hormone replacement (hydrocortisone, fludrocortisone)

Tumor removal, reduce steroid use, medications





3. Psychological Symptoms

Addison’s Disease:

  • Depression, apathy, and anxiety due to cortisol deficiency.

  • Irritability and cognitive impairment (difficulty concentrating, poor memory).

  • Psychosis can occur during adrenal crises (rare but serious).

Cushing’s Syndrome:

  • Mood swings, anxiety, irritability, and aggression.

  • Insomnia and cognitive problems (memory and concentration issues).

  • Psychiatric symptoms such as mania, paranoia, and psychosis are more likely in severe or untreated cases.


4. Metabolic and Carbohydrate Effects

Cushing’s Syndrome and Carbohydrates:

  • Excess cortisol increases gluconeogenesis (glucose production).

  • Associated with:

  • High-carbohydrate diets, especially those rich in refined sugars, can worsen metabolic symptoms.

Addison’s Disease:

  • Cortisol deficiency can cause low blood sugar and reduced stress tolerance, but it is not typically linked to carbohydrate metabolism dysfunction unless during adrenal crises.



Hypercalcaemia in Adrenal Disorders

  • Hypercalcaemia (high blood calcium levels) can occur in Addison’s disease, though it’s rare.

  • Possible mechanisms:

    • Reduced renal calcium excretion

    • Volume depletion leading to hemoconcentration

  • Not caused by hard water, which does not typically affect blood calcium levels.

Symptoms of Hypercalcaemia:

  • Nausea, vomiting, constipation

  • Thirst, frequent urination

  • Muscle weakness

  • Fatigue or confusion

  • Bone pain, fractures

Reference: Penn Medicine - Hypercalcemia






Diagnosis of Cushing’s Syndrome

Why the Dexamethasone Suppression Test is Important:

  • Dexamethasone suppresses cortisol production in healthy individuals.

  • In Cushing’s syndrome, cortisol remains high after dexamethasone administration, indicating a regulatory problem.




Additional Diagnostic Tests:

  • 24-hour urinary free cortisol

  • Late-night salivary cortisol

  • Serum ACTH levels

  • Imaging (CT/MRI of adrenal/pituitary glands)

  • Inferior petrosal sinus sampling (to localize ACTH source)




Glucocorticoids – What Are They?

  • Glucocorticoids are a class of steroid hormones produced by the adrenal cortex.

  • Their main functions:

    • Regulate metabolism (especially glucose metabolism)

    • Suppress inflammation

    • Help the body respond to stress

  • Cortisol is the primary natural glucocorticoid in humans.

  • Synthetic glucocorticoids (e.g., dexamethasone, prednisone) are used to treat inflammatory and autoimmune conditions but can cause Cushing’s syndrome if overused.

    In Summary



Category

Addison’s Disease

Cushing’s Syndrome

Cause

Adrenal gland destruction, autoimmune, infections

Cortisol overproduction (tumors, steroids)

Hormone Levels

Low cortisol, aldosterone

High cortisol

Key Symptoms

Fatigue, weight loss, low BP, hyperpigmentation

Obesity, moon face, high BP, diabetes

Psychological

Depression, apathy, psychosis (rare)

Mood swings, anxiety, psychosis (severe cases)

Calcium Levels

May be elevated (hypercalcaemia)

Usually normal, but can cause hypokalemia

Carbohydrate Impact

Minimal

Insulin resistance, glucose intolerance

Treatment

Hormone replacement

Tumor removal, medications, stop steroid use



References: 

Addison's disease: Overview of an uncommon but serious condition
https://www.health.harvard.edu/diseases-and-conditions/addisons-disease-overview-of-an-uncommon-but-serious-condition#:~:text=marked%20fatigue,system%20attacks%20the%20adrenal%20glands.

Cushing's Syndrome and Disease | Clinical Medicine 
https://www.youtube.com/watch?v=0rRRmrLmcBM



Read also: https://swaresearch.blogspot.com/2023/10/cortisol-endocrine-system-hypothalamic.html

Glucocorticoid https://www.cancer.gov/publications/dictionaries/cancer-terms/def/glucocorticoid

Addison's disease 
https://www.mayoclinic.org/diseases-conditions/addisons-disease/symptoms-causes/syc-20350293

Cushing syndrome 
https://www.mayoclinic.org/diseases-conditions/cushing-syndrome/symptoms-causes/syc-20351310

National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) - Cushing's Syndrome: https://www.niddk.nih.gov/health-information/endocrine-diseases/cushings-syndrome

MedlinePlus - Addison's Disease: https://medlineplus.gov/addisonsdisease.html
MedlinePlus - Cushing's Syndrome: https://medlineplus.gov/cushingssyndrome.html

MedlinePlus - Cushing's Syndrome: https://medlineplus.gov/cushingssyndrome.html

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© 2025-2030 Sieglinde W. Alexander. All writings by Sieglinde W. Alexander have a fife year copy right. Library of Congress Card Number: LCN 00-192742 ISBN: 0-9703195-0-9

























 

 

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