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Stress Hormone – Effects, Cortisol & Health

Stress hormones are chemical messengers released by the body during stressful situations. They prepare the body for fight or flight and influence many physiological functions.

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Things worth knowing about "Stress Hormone"

Stress hormones are chemical messengers released by the body during stressful situations. They prepare the body for fight or flight and influence many physiological functions.

What Is a Stress Hormone?

A stress hormone is a naturally occurring chemical messenger released in response to physical or psychological stress. The most well-known stress hormones are cortisol, adrenaline (epinephrine), and noradrenaline (norepinephrine). They are primarily produced in the adrenal glands and help the body respond effectively to challenging situations.

Types of Stress Hormones

Cortisol: Often referred to as the primary stress hormone, cortisol is produced in the adrenal cortex. It regulates metabolism, immune function, and blood sugar levels. Chronically elevated cortisol can have harmful effects on health.
Adrenaline (Epinephrine): Released from the adrenal medulla during acute stress, adrenaline rapidly increases heart rate, blood pressure, and blood flow to the muscles.
Noradrenaline (Norepinephrine): Similar in action to adrenaline but also functions as a neurotransmitter in the brain, influencing alertness and concentration.
DHEA (Dehydroepiandrosterone): Another adrenal hormone considered a counterpart to cortisol that may have protective effects.

Mechanism of Action

When the brain perceives a stressful situation, it activates the hypothalamic-pituitary-adrenal (HPA) axis. The hypothalamus signals the pituitary gland, which in turn stimulates the adrenal glands to release stress hormones. Adrenaline and noradrenaline are released within seconds, while cortisol follows with a slight delay but has a longer-lasting effect. Together, these hormones increase energy availability, elevate heart rate, and sharpen the senses – preparing the body to fight or flee.

Effects on the Body

Short-Term Effects

Increased heart rate and blood pressure
Heightened muscle tension
Dilation of the airways
Elevated blood sugar (glucose released from reserves)
Reduced sensitivity to pain

Long-Term Effects of Chronic Stress

Weakened immune system
Sleep disturbances and fatigue
Weight gain, particularly around the abdomen
Increased risk of cardiovascular disease
Memory and concentration problems
Mood swings, anxiety, and depression

Diagnosis and Measurement

Stress hormones can be measured in blood, urine, or saliva. Cortisol levels are commonly measured in the morning when they are naturally at their highest (known as the cortisol awakening response). Persistently elevated or reduced cortisol levels may indicate conditions such as Cushing syndrome or Addison disease and should be evaluated by a physician.

Treatment and Stress Management

Chronically elevated stress hormone levels should be taken seriously. The following measures can help regulate hormone levels:

Regular physical activity: Exercise helps break down stress hormones and promotes the release of endorphins.
Relaxation techniques: Meditation, yoga, progressive muscle relaxation, and breathing exercises can reduce cortisol levels.
Adequate sleep: Sleep is essential for recovery and hormonal balance.
Balanced nutrition: A nutrient-rich diet supports hormone regulation.
Psychotherapy or coaching: Professional support is recommended for chronic stress.
Medical treatment: In severe cases, such as adrenal gland disorders, medical therapy may be necessary.

References

Chrousos, G.P. (2009): Stress and disorders of the stress system. Nature Reviews Endocrinology, 5(7), 374-381.
World Health Organization (WHO): Mental health and stress-related disorders. Available at: https://www.who.int/news-room/fact-sheets/detail/mental-disorders
Tsigos, C., Kyrou, I., Kassi, E., Chrousos, G.P. (2020): Stress: Endocrine Physiology and Pathophysiology. In: Endotext [Internet]. MDText.com, Inc.

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