Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Cortisol helps blood vessels squeeze when you are stressed, tells your liver to make sugar for energy, and keeps your body balanced during illness or injury.
City Power Grid Blackout During Storm
Imagine a city whose power plant (adrenal cortex) supplies electricity to three critical systems: traffic lights (blood vessels), streetlights and factories (liver making glucose), and water treatment plants (kidneys balancing salt and potassium). During a storm (infection, surgery, or stress), demand for power spikes 5–10 times normal. If the power plant is destroyed by fire (autoimmune attack), flooded (tuberculosis or bleeding (hemorrhage)), or taken offline by a switch (pituitary tumor stopping the signal), it cannot meet the surge. Traffic lights go dark and cars (blood cells and oxygen) crash—this is refractory low blood pressure (hypotension). Factories shut down and the city runs out of fuel—this is low blood sugar (hypoglycemia). Water treatment fails and sewage backs up—this is high potassium (hyperkalemia) and low sodium (hyponatremia). The city tries to compensate by running on backup generators (adrenaline pumps), but backup power only works for minutes to hours before the whole system collapses.
Endocrine Society Clinical Practice Guideline on Primary Adrenal Insufficiency (2016) · UpToDate Clinical Topic: Adrenal Crisis · American Association of Clinical Endocrinology (AACE) guidelines on adrenal insufficiency · Cochrane systematic reviews on glucocorticoid replacement therapy · reviewed 2026-07-07