Last reviewed: May 12, 2026 Last updated: May 12, 2026

Written by: Jay Hastings , CEO of PlexusDx

Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations. He has more than 20 years of experience across healthcare innovation, genomics, laboratory operations, healthcare investing, and strategic finance. His work has included scaling healthcare startups, leading CLIA lab integrations, and helping expand consumer access to precision health tools.

Medically reviewed by: Jayden Lee, PharmD, EMBA

Jayden Lee, PharmD, EMBA, is the PlexusDx Medical Science Liaison with a PharmD and MBA specializing in pharmacogenomics and clinical product development, with a proven ability to bridge the gap between genomic research and practical patient outcomes. Dr. Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research.

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Addison's disease, also called primary adrenal insufficiency, occurs when the adrenal glands can no longer produce enough cortisol and, often, aldosterone. It is uncommon but serious, and managing it well means understanding both its causes and the genetic factors that raise a person's risk. Effective management is always built around a qualified healthcare provider — this article explains the biology and where genetics fits, not a self-directed plan.

Understanding Addison's disease

The adrenal glands sit atop the kidneys and produce hormones essential for blood pressure, metabolism, electrolyte balance, and the body's response to stress. In Addison's disease the outer adrenal cortex is damaged, cutting cortisol and aldosterone output. Symptoms — fatigue, weight loss, low blood pressure, salt craving, and darkening of the skin — often develop slowly, which is why the condition can go unrecognized until an adrenal crisis, a medical emergency, brings it to light. In developed countries, the most common cause is autoimmune: the immune system mistakenly attacks adrenal tissue.

The genetic factors behind autoimmune Addison's

Because the leading cause is autoimmune, the strongest genetic risk factors are immune-regulation genes. Variants in the HLA region — particularly HLA-DR3 and HLA-DR4 haplotypes tied to HLA-DQB1 — carry the largest common effect. Additional risk comes from CTLA4 and PTPN22, two genes that help set the threshold for immune activation; the same variants also appear in type 1 diabetes and autoimmune thyroid disease, which is why these conditions frequently cluster in the same person or family.

AIRE and the monogenic form

A rare but instructive form is driven by a single gene. Mutations in AIRE (the autoimmune regulator) cause autoimmune polyendocrine syndrome type 1 (APS-1), in which Addison's disease appears alongside other endocrine failures. AIRE normally teaches developing immune cells to tolerate the body's own tissues; when it fails, self-tolerance breaks down. Studying this monogenic condition has taught researchers a great deal about how the more common polygenic, autoimmune form of Addison's develops.

Working with a qualified provider

Standard clinical management of Addison's disease centers on replacing the hormones the adrenal glands can no longer make — a strategy directed and dosed entirely by an endocrinologist or other qualified provider, individualized to each patient and adjusted during illness or stress. This article does not provide dosing or a treatment protocol. The essential point is that Addison's disease is highly manageable when diagnosed and monitored by a clinician, and that people with it typically carry guidance for recognizing and responding to an adrenal crisis.

Lifestyle and monitoring context

Alongside provider-directed care, people managing chronic conditions often focus on consistent follow-up, adequate hydration and electrolytes, attention to salt and fluid needs during heat or gastrointestinal illness, restorative sleep, and stress management. These are general wellness supports discussed with a care team, not substitutes for medical treatment. Recognizing early warning signs and maintaining regular monitoring are central to long-term stability.

What genetic insight can add

Genetics helps explain why autoimmune conditions cluster in families, but it does not diagnose Addison's disease. The PlexusDx Precision Peptide Genetic Test analyzes 14 pathways, 49 peptides, 150+ genetic insights across peptide-related biological pathways, offering pathway-level context about your biology — education, not a diagnostic or treatment tool. It does not diagnose, treat, cure, manage, or prevent Addison's disease or any condition. As the PlexusDx principle puts it: the test tells you about your biology; it does not tell you what to put in your body.

Frequently Asked Questions

Is Addison's disease genetic?

Addison's disease is not usually inherited directly, but genetics strongly influences risk. Immune-regulation genes in the HLA region and in CTLA4 and PTPN22 raise susceptibility to the common autoimmune form, while rare AIRE mutations cause a monogenic version. Environment and other factors also contribute.

What is the most common cause of Addison's disease?

In developed countries, autoimmune destruction of the adrenal cortex is the most common cause, accounting for the majority of cases. The immune system attacks adrenal tissue, reducing cortisol and aldosterone. Worldwide, infections such as tuberculosis remain important causes in some regions.

Can genetic testing diagnose Addison's disease?

No. Addison's disease is diagnosed by a healthcare provider using blood tests for cortisol, ACTH, and specific antibodies, not by genetic testing. Genetic insight can describe pathway-level context about immune biology, but diagnosis and management require clinical evaluation and ongoing medical care.

Do other autoimmune conditions run with Addison's disease?

Yes. Because shared immune genes such as CTLA4 and PTPN22 underlie several autoimmune disorders, Addison's disease often coexists with type 1 diabetes, autoimmune thyroid disease, and, in APS-1, additional endocrine conditions. A provider may monitor for these related disorders over time.

Want pathway-level context on your own immune and hormone biology? Take the Precision Peptide Genetic Test to see what pathway-level genetic context can add to your conversation with a qualified provider.

Disclaimer: The Precision Peptide Genetic Test analyzes how your genes influence peptide-related biological pathways. It does not recommend, prescribe, or determine which peptides you should use. Consult a qualified healthcare provider before beginning any peptide protocol.

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Medical and Editorial Standards

Medical review process: This article was reviewed for medical accuracy, scientific clarity, evidence alignment, and appropriate discussion of genetics, medications, supplements, biomarkers, and health-related claims.

Sources and evidence: PlexusDx educational content is developed using peer-reviewed research, clinical literature, reputable medical references, and, where applicable, public health or regulatory guidance. References are included at the end of the article when scientific, medical, or health-related claims are discussed.

Commercial transparency: PlexusDx offers genetic testing, blood biomarker testing, personalized supplement recommendations, and related precision wellness services. Product mentions are intended to help readers understand available options and should not be interpreted as medical advice.

Important disclaimer: PlexusDx educational content is for informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about medications, supplements, genetic testing, lab testing, or health-related care.