Flu, the Flu Shot & Adrenal Insufficiency

Flu, the Flu Shot & Adrenal Insufficiency: What Changes When Your Body Cannot Make Enough Cortisol?

For most people, the flu means several miserable days of fever, body aches, and exhaustion. But when you live with adrenal insufficiency, influenza can create an entirely different challenge: your body may not be able to produce the additional cortisol it needs to respond to illness.

In this episode of the My Adrenal Life Podcast, we explore why influenza deserves special attention in people living with primary, secondary, tertiary, and steroid-induced adrenal insufficiency—and how vaccination, sick-day planning, and emergency preparedness can help reduce the risks.

We begin with the science behind the body’s response to infection. During influenza, fever, inflammation, dehydration, and changes in metabolism increase the body’s need for cortisol. For someone with adrenal insufficiency, that increased demand can exceed the body’s ability to respond, making an ordinary respiratory infection a potential adrenal-management emergency.

We discuss why infections can trigger adrenal crisis, how vomiting or diarrhea can interfere with oral glucocorticoid absorption, and why recognizing worsening symptoms early is so important. We also explain the differences between primary adrenal insufficiency, where aldosterone deficiency may complicate fluid and sodium balance, and secondary or tertiary adrenal insufficiency, where aldosterone production is generally preserved.

Then we tackle one of the biggest questions in our community: Should people with adrenal insufficiency get the flu shot?

We examine the 2026–2027 influenza vaccine recommendations, how vaccination helps reduce the risk of influenza and serious complications, and why taking physiologic cortisol replacement is not the same as being immunosuppressed by high-dose corticosteroid treatment.

We also explore the differences between injectable influenza vaccines and the live attenuated nasal spray, along with another frequently debated question: Does getting a flu shot automatically mean you need to stress dose? The discussion explains why vaccine administration alone does not create a universal need for additional glucocorticoids, while fever or significant systemic symptoms may require following an individual’s prescribed sick-day plan.

Beyond vaccination, we discuss antiviral medications, blood sugar changes during illness, hydration and sodium considerations, and the added complexity of managing influenza alongside diabetes, hypertension, thyroid disease, or other chronic conditions.

Perhaps most importantly, we focus on preparedness. Knowing your sick-day instructions, understanding when oral medication may no longer be reliable, having an emergency injection kit available, and recognizing when urgent medical care is needed can make a meaningful difference when illness strikes.

The flu shot doesn’t guarantee you won’t get influenza, and having adrenal insufficiency doesn’t mean you need to live in fear of every virus.

It means understanding how your body’s response to illness is different—and having the knowledge, medical guidance, and emergency plan to respond appropriately.

Because the goal isn’t to fear flu season. It’s to enter it informed, prepared, and confident about what to do if you become sick.

To learn more, explore the My Adrenal Life Books Authored by founder Rick Disler available on Amazon, visit www.myadrenallife.com, and join our supportive My Adrenal Life Facebook Group for education, discussion, and community.