Here’s What It Actually Means to Be Overstimulated—And How to Fight It, According to Experts

Reported by Women's Health Magazine.

That moment when you're standing in a packed airport — shrieking toddlers, fluorescent lights buzzing overhead, some stranger's tuna sandwich invading your personal space — and your entire nervous system screams abort mission? That's not you being dramatic. That's overstimulation, and it's a real, measurable physiological event happening in your brain.

According to Women's Health Magazine, overstimulation — sometimes called sensory overload — occurs when your brain is hit with more sensory input (sound, light, smell, touch, taste) than it can efficiently filter. Normally, your thalamus acts as a built-in gatekeeper, deciding what's worth your conscious attention. But when sensory information floods in faster than that system can sort it, your prefrontal cortex goes into overdrive, triggering hyperarousal: fight-or-flight tension, irritability, bone-deep fatigue. Neuroscientist Lila Landowski, PhD, of the University of Tasmania and clinical neuropsychologist Heidi Bender, PhD, of New York-Presbyterian and Weill Cornell Medicine both explain the mechanism — and why some people hit that wall much sooner than others. Neurodivergent people, including those with ADHD or autism, are disproportionately affected because their prefrontal cortices process sensory input differently, making hypersensitivity more likely. But neurodivergence isn't the only factor: roughly 30 percent of the general population scores high on sensory processing sensitivity, per a Scientific Reports study — meaning nearly a third of us have nervous systems that are simply wired to feel everything louder.

Overstimulation vs. Overwhelm — and How to Actually Come Down

Worth knowing: overstimulation and overwhelm are not interchangeable. Psychiatrist Sasha Hamdani, MD, who specializes in ADHD, draws a clear line — overstimulation is external (your environment is too much), while overwhelm is internal (your thoughts, tasks, and decisions are piling up). The two can absolutely collide and amplify each other, but identifying the source matters, because the fix looks different. Bender recommends pausing to ask yourself honestly: is your heart racing because of the subway noise, or because your weekend to-do list has become a small novel?

If the culprit is sensory, there are concrete ways to reset. Removing yourself from the stimulus — even briefly stepping outside a loud event — gives your brain's filter a chance to clear. Exhale-heavy cyclic sighing (two sharp inhales, one long exhale, repeated for a few minutes) is clinically proven to drop heart rate faster than meditation, per a 2023 Cell Reports Medicine study. Landowski points to green space as a surprisingly powerful tool: just 20 minutes in nature can lower cortisol levels by around 20 percent, according to research in Frontiers in Psychology. And if you're already fried, skip the third espresso — Hamdani puts it plainly: caffeine on an overstimulated nervous system is gasoline on a fire. The Scientific Reports study also found overstimulation peaks between 1 p.m. and 7 p.m., which is a solid argument for actually taking that afternoon break instead of powering through it.

Your nervous system is not a liability — but ignoring what it's telling you is.

Read the original at Women's Health Magazine.