How Your Brain Rewrites Stress Responses

Dr. Joseph Mercola - Take Control of Your Health

Briana Mercola

Alternative Health, Health & Fitness

4.6 • 1.6K Ratings

🗓️ 20 September 2025

⏱️ 7 minutes

🔗️ Recording | iTunes | RSS

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Summary

Old injuries don't just leave physical scars — they rewire your stress system, making everyday situations feel more threatening than they really are
Stress hormones act like fuel that keeps fear and pain responses locked in place, which helps explain why anxiety and chronic pain often linger
Trauma survivors who recover better use brain networks more efficiently, allowing them to separate safe cues from real danger and avoid living in constant high alert
Simple steps like improving sleep, getting morning sunlight, and gradually retraining your brain with safe exposures help reset stress circuits and restore calm
Nutrition and energy support, including healthy carbohydrates and creatine, strengthen your brain's resilience and give you a better foundation for healing after trauma

Transcript

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0:00.0	Have you noticed how a harmless sound or surprise can flood you with fear long after an injury has healed,
0:06.0	as if your body can't tell safety from danger anymore?
0:09.0	Welcome to Dr. Mercola's cellular wisdom.
0:12.0	Stay informed with quick, easy-to-listen summaries of our latest articles, perfect for when you're on the go.
0:18.0	No reading required. Subscribe for free at Mercola.com for the latest health insights.
0:22.6	Hello and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster and today
0:28.3	we're examining how past injury and trauma can rewrite your stress circuits and
0:32.5	what you can do to reset them so you aren't living on constant high alert. I'm Alara Sky.
0:38.6	The core idea is straightforward.
0:41.3	Old injuries don't just leave physical scars.
0:44.2	They prime your nervous system.
0:46.6	Your stress hormones and specific nerve sensors begin treating safe cues as threats.
0:51.4	That's why everyday situations can feel magnified,
0:56.6	and it's why anxiety and chronic pain can persist even when there's no immediate danger. A recent current biology study shows this clearly.
1:02.4	Mice with a prior injury were exposed to a predator's scent. Compared to healthy mice, the previously
1:08.0	injured group froze much longer and developed long-lasting
1:11.7	pain sensitivity, even in an uninjured paw, and that hypersensitivity persisted for over
1:17.3	six months. In human terms, that suggests years of heightened reactivity, long after tissues
1:23.8	appear healed.
1:25.8	Hormones and sensors kept that fear locked in.
1:28.3	Injured mice had a surge of corticosterone, the rodent equivalent of cortisol.
1:34.3	When researchers blocked corticosterone production, the exaggerated freezing diminished and pain sensitivity eased.
	...

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