Why Your Brain Thinks Everything Is a Bear

By Debby Maloney, MSN, APRN, FNP-BC

Stress gets blamed for a lot of things — poor sleep, brain fog, short tempers, sugar cravings — and honestly? Sometimes it deserves the blame.

But stress isn’t the villain. Stress is the reason humans survived long enough to have heated homes, snow tires, and very strong opinions about coffee.

If you’re hiking in Alaska and suddenly come face-to-face with a bear, stress is exactly what you want. Your brain doesn’t pause to analyze. It reacts. Adrenaline surges. Cortisol rises. Your heart beats faster, your blood pressure climbs, and glucose floods your bloodstream so you can move — fast.

That’s stress doing its job.

The trouble is that your brain doesn’t know the difference between a bear on the trail and a packed calendar, poor sleep, financial pressure, chronic pain, weight changes, or months of quiet, persistent worry. To your nervous system, stress is stress. And modern life rarely gives it a clear signal that the danger has passed.

So the switch stays on.

When stress becomes chronic, the brain adapts — but not in a way that feels good. Systems designed for short bursts of survival stay engaged far longer than intended. Over time, chronic stress reshapes how the brain processes threat, emotion, and recovery. The brain becomes quicker to react, slower to relax, and more sensitive to anything it perceives as a potential problem.

In plain language: your brain learns stress — and then gets very good at it.

That constant state of alert doesn’t just affect mood. It shows up everywhere.

Blood pressure, for example, is meant to rise briefly during stress and then settle back down. But when stress is ongoing, blood vessels stay a little tighter than they should. Heart rate stays elevated. Over time, blood pressure becomes harder to control — even in people who eat well and stay active.

Blood sugar behaves similarly. Stress hormones signal the liver to release glucose so the body has quick fuel. That’s helpful in an emergency. But repeated stress makes the body less responsive to insulin, causing glucose levels to rise more easily and stay elevated longer. This is one reason stress can complicate prediabetes and diabetes management, even when someone is “doing everything right.”

And then there’s weight gain — often one of the most frustrating and misunderstood effects of chronic stress.

Cortisol influences where and how the body stores energy. Under ongoing stress, the body becomes more efficient at storing fat, particularly around the abdomen. Stress also increases insulin resistance, disrupts hunger and fullness cues, and pushes the body toward energy conservation. Add poor sleep and chronic fatigue, and weight gain can occur even without major changes in diet or activity.

This isn’t a willpower issue. It’s physiology.

Pain fits into this same pattern.

In acute stress, pain perception can temporarily decrease — a useful survival trick. But chronic stress does the opposite. The nervous system becomes more reactive, amplifying pain signals. This helps explain why migraines, joint pain, low back pain, and conditions like fibromyalgia often flare during stressful periods, even when imaging or labs don’t show dramatic changes.

Stress doesn’t create these symptoms out of thin air — but it can absolutely turn the volume up.

What makes this even trickier is that stress doesn’t only come from the outside. Yes, work pressure, finances, relationships, noise, screens, and long winters all play a role. But internal stress matters just as much. Negative self-talk, perfectionism, poor sleep, and constant mental replay can keep the nervous system activated even when life looks “fine” on paper.

Your nervous system doesn’t rank stress. It doesn’t care where it comes from. It just responds.

The goal, then, isn’t to eliminate stress altogether. That’s unrealistic. The goal is to remind the nervous system how to stand down.

Sometimes that looks simple: slower breathing, gentler movement, regular meals with enough protein, consistent sleep. These aren’t trendy wellness tips — they’re signals of safety. They tell the brain it doesn’t need to stay on guard.

Other times, the system needs extra help.

This is where approaches like acupuncture can be useful. Rather than masking symptoms, acupuncture appears to influence the nervous system directly — reducing fight-or-flight activity, increasing rest-and-digest tone, and improving heart rate variability. For many people, it’s one of the fastest ways to help the body exit survival mode, especially when stress, pain, and weight changes feel deeply physical.

Nutrients matter too. Vitamin D supports brain, immune, and musculoskeletal health — and deficiency is common in low-sunlight climates. Magnesium helps regulate nerve signaling, muscle tension, and sleep, and stress itself increases magnesium loss. B vitamins play a key role in neurotransmitter production and nerve health, and chronic stress raises the body’s demand for them. These aren’t cures, but they can support recovery when used thoughtfully.

As all of this adds up, many people begin to notice a pattern. Blood pressure rises during stressful months. Blood sugar is harder to manage when sleep falls apart. Weight creeps up despite consistent habits. Pain flares when life feels overwhelming. Symptoms don’t exist in isolation — they move together.

That’s often the moment to bring the bigger picture into the exam room.

Not to say “it’s all stress,” and not to dismiss symptoms — but to ask whether the nervous system itself might be influencing what’s happening.

You don’t need perfect language. You don’t need a long explanation.

Sometimes the most helpful question is also the simplest:

How is my nervous system influencing my health — and how can we support it?

That question shifts the conversation. It opens the door to looking not just at symptoms, but at the system underneath them — and at what your body needs to feel safe enough to heal.

Even when life feels a little wild. 🐻