How does stress affect the brain?
Quick Answer
Short-term stress can sharpen alertness, but long-term stress can impair memory, mood, and decision-making. The hormone cortisol plays a major role.
The Full Story
When the brain detects a threat, the body releases stress hormones through the hypothalamic-pituitary-adrenal axis. Cortisol and adrenaline can help you react quickly in the short term, but chronic elevation can disrupt sleep, concentration, and learning. The hippocampus and prefrontal cortex are especially sensitive to prolonged stress. Chronic stress is also linked to anxiety and depression. Scientists have studied stress physiology for decades because it affects both brain function and physical health.
Key Facts
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"Why stress can help you in the moment but hurt you over time"
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