The most common cause of Addison’s disease is –
**Core Concept**
Addison's disease is a rare endocrine disorder characterized by the insufficient production of cortisol and aldosterone hormones by the adrenal glands. This condition can be caused by various factors, including autoimmune destruction of the adrenal glands, infections, and genetic disorders.
**Why the Correct Answer is Right**
The most common cause of Addison's disease is autoimmune adrenalitis, also known as primary adrenal insufficiency. In this condition, the immune system mistakenly attacks and damages the adrenal glands, leading to the destruction of the cells responsible for producing cortisol and aldosterone. **Autoimmune adrenalitis is often associated with other autoimmune disorders, such as Hashimoto's thyroiditis, type 1 diabetes, and rheumatoid arthritis.**
**Why Each Wrong Option is Incorrect**
* **Option A:** Tuberculous adrenalitis is a rare cause of Addison's disease, typically seen in regions with high tuberculosis prevalence.
* **Option B:** Congenital adrenal hyperplasia is a genetic disorder that affects the production of steroid hormones, but it is not the most common cause of Addison's disease.
* **Option C:** Metastatic cancer to the adrenal glands is a rare cause of Addison's disease, typically seen in patients with advanced cancer.
**Clinical Pearl / High-Yield Fact**
Autoimmune adrenalitis is often associated with other autoimmune disorders, and patients with Addison's disease may also have other autoimmune conditions.
**Correct Answer:** A. Autoimmune adrenalitis.