Navigating the Cortisol Roller Coaster

Why can blood sugar feel so unpredictable with adrenal insufficiency, even when you are eating regularly and taking your medication as prescribed?

In this episode, Jake and Rachel explore a My Adrenal Life topic many people recognize but rarely see explained clearly: the connection between cortisol and blood sugar instability.

Cortisol is often called a “stress hormone,” but it also plays a major role in keeping blood sugar steady. It helps the body release stored glucose from the liver, supports blood sugar between meals and during sleep, and works as part of the body’s counter-regulatory system to help prevent glucose from dropping too low.

When cortisol is reduced, poorly timed, or inconsistent, blood sugar regulation can become much harder.

Jake and Rachel explain why people with adrenal insufficiency may experience:

• shakiness, weakness, or sudden fatigue after meals
• waking in the night feeling sweaty or unsettled
• significant weakness in the morning before medication kicks in
• midday or afternoon crashes
• symptoms that feel like anxiety but may actually reflect adrenaline compensation

One key point in the episode is that insulin lowers blood sugar after eating, while cortisol helps prevent that drop from going too far. In adrenal insufficiency, that cortisol “buffer” is weaker or missing, so some people may experience post-meal crashes that feel sudden and intense.

The conversation also explains why these episodes can feel so dramatic. When cortisol is low, the body may rely more heavily on adrenaline to compensate. That can create symptoms like:

• trembling
• sweating
• racing heart
• irritability
• a sense of panic or internal alarm

This is one reason blood sugar instability in adrenal insufficiency can sometimes be mistaken for anxiety.

The episode also looks at overnight blood sugar instability. During sleep, the body depends on cortisol to help maintain glucose while fasting. If cortisol levels are low overnight, the body may struggle to keep blood sugar stable, which can trigger nighttime waking, sweating, poor sleep, and feeling depleted in the morning.

Another major theme is the timing gap created by cortisol replacement. The body naturally releases cortisol in small changing amounts across the day, but oral medications are absorbed in larger doses that rise and fall more abruptly. Even when the total daily dose is appropriate, there may still be periods when cortisol levels dip below what the body needs. That can contribute to early morning weakness, post-meal symptoms, and afternoon crashes.

Jake and Rachel also touch on how this can look different across types of adrenal insufficiency:

• Primary adrenal insufficiency (Addison’s disease): cortisol and aldosterone are both affected, increasing vulnerability during illness, dehydration, or physical stress
• Secondary and tertiary adrenal insufficiency: aldosterone is usually preserved, but cortisol instability can still cause major blood sugar symptoms
• Steroid-induced adrenal insufficiency: patterns may be shaped by both cortisol deficiency and the metabolic effects of prior steroid exposure

The episode emphasizes that these symptoms are real, even when they are hard to capture on a single lab test. Blood sugar and cortisol both change throughout the day, so a normal result does not always reflect what someone experiences hour to hour.

The core message: these patterns are not imagined, and noticing them is not overthinking. It is part of learning how a complex condition affects the body in daily life.

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