What biological mechanisms cause the body to transition from a short term acute stress response to chronic stress?
The transition from acute to chronic stress primarily involves the dysregulation of the HPA axis, which stands for the hypothalamus-pituitary-adrenal axis. In a healthy acute stress response, the hypothalamus releases hormones that trigger the adrenal glands to release cortisol. This provides a quick burst of energy to handle immediate threats. Once the threat passes, the body uses a negative feedback loop to signal the brain to stop producing these stress hormones, returning the system to a state of balance.
p>Chronic stress occurs when this feedback loop fails due to repeated or prolonged activation. When the brain perceives constant pressure, the hypothalamus continues to signal the adrenal glands to release cortisol. Over time, the body's receptors become less sensitive to these hormonal signals. This state of constant high cortisol levels prevents the endocrine system from returning to its resting state. Instead of a temporary spike, the body enters a continuous loop of hormonal production, which can lead to various long term health issues affecting metabolism, immunity, and cardiovascular function.
