addisson - Parker Core Knowledge

Understanding the Context

Addison’s disease results from the adrenal cortex dismantling its hormone production. This destruction is typically caused by autoimmune dysfunction, where the immune system mistakenly attacks healthy adrenal tissue. Less commonly, infections (such as tuberculosis), cancer, or genetic conditions can lead to adrenal insufficiency.

Key Symptoms of Addison’s Disease

Due to the gradual onset of hormone deficiency, symptoms often develop slowly and may be mistaken for stress or fatigue. Common signs include:

• Persistent fatigue and weakness
  
• Weight loss and decreased appetite
  
• Low blood pressure, especially when standing (orthostatic hypotension)
  
• Salt craving due to aldosterone deficiency
  
• Darkening of the skin (hyperpigmentation), particularly in scars, skin folds, and mucous membranes
  
• Gastrointestinal symptoms like nausea, vomiting, or abdominal pain
  
• Hypoglycemia (low blood sugar)
  
• Dizziness or fainting episodes

Key Insights

Enthusiastic celebrities like actress Susan Savage and veteran athletes have publicly shared their struggles with Addison’s, raising awareness and reducing stigma.

Causes and Risk Factors

The most prevalent cause today is autoimmune Addison’s, where the immune system attacks adrenal glands, often alongside other autoimmune disorders such as thyroid disease or type 1 diabetes. Other risk factors include:

• Chronic infections damaging adrenal tissue
  
• Adrenal hemorrhage or hijacking from cancer
  
• Genetic predispositions passed through families
  
• Prolonged steroid use leading to adrenal suppression

Understanding these triggers helps in early detection, especially in high-risk populations.

Final Thoughts

Diagnosis and Testing

Because symptoms mimic many other conditions, diagnosing Addison’s requires careful medical evaluation. Key tests include:

• Hormone level blood tests measuring cortisol, ACTH, and electrolytes
  
• Acth stimulation (synacthen) test to assess adrenal response
  
• Autoantibody screening to confirm autoimmune causes
  
• Imaging like adrenal CT scans to visualize gland damage

Early and accurate diagnosis is crucial to prevent adrenal crises—medically urgent situations requiring immediate hormone replacement and emergency treatment.

Treatment and Management

The mainstay of Addison’s treatment is lifelong hormone replacement therapy, typically involving:

• Glucocorticoid replacement, such as hydrocortisone, to mimic natural cortisol
  
• In some cases, mineralocorticoid replacement (like fludrocortisone) to maintain sodium balance and blood pressure