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What Is Cortisol?
Think of cortisol as nature’s built-in alarm system. It’s your body’s main stress hormone. It works with certain parts of your brain to control your mood, motivation, and fear.
Your adrenal glands -- triangle-shaped organs at the top of your kidneys -- make cortisol.
It’s best known for helping fuel your body’s “fight-or-flight” instinct in a crisis, but cortisol plays an important role in a number of things your body does. For example, it:
Manages how your body uses carbohydrates, fats, and proteins
Keeps inflammation down
Regulates your blood pressure
Increases your blood sugar (glucose)
Controls your sleep/wake cycle
Boosts energy so you can handle stress and restores balance afterwards
How Does It Work?
Your hypothalamus and pituitary gland -- both located in your brain -- can sense if your blood contains the right level of cortisol. If the level is too low, your brain adjusts the amount of hormones it makes. Your adrenal glands pick up on these signals. Then, they fine-tune the amount of cortisol they release.
Cortisol receptors -- which are in most cells in your body -- receive and use the hormone in different ways. Your needs will differ from day to day. For instance, when your body is on high alert, cortisol can alter or shut down functions that get in the way. These might include your digestive or reproductive systems, your immune system, or even your growth processes.
Sometimes, your cortisol levels can get out of whack.
Too Much Stress
After the pressure or danger has passed, your cortisol level should calm down. Your heart, blood pressure, and other body systems will get back to normal.
But what if you’re under constant stress and the alarm button stays on?
It can derail your body’s most important functions. It can also lead to a number of health problems, including:
Anxiety and depression
Headaches
Heart disease
Memory and concentration problems
Problems with digestion
Trouble sleeping
Weight gain
Too Much Cortisol
A nodule (mass) in your adrenal gland or a tumour in the brain’s pituitary gland can trigger your body to make too much cortisol. This can cause a condition called Cushing syndrome. It can lead to rapid weight gain, skin that bruises easily, muscle weakness, diabetes, and many other health problems.
Too Little Cortisol
If your body doesn’t make enough of this hormone, you have a condition doctors call Addison’s
disease. Usually, the symptoms appear over time. They include:
Changes in your skin, like darkening on scars and in skin folds
Being tired all the time
Muscle weakness that grows worse
Diarrhoea, nausea, and vomiting
Loss of appetite and weight
Low blood pressure
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