When someone around you is visibly anxious, and you start feeling your own heart rate climb and your thoughts spiral, that’s not a character flaw or overreaction. It’s a well-documented biological process called emotional contagion, and it happens faster than conscious thought. Your brain is essentially built to absorb the emotional states of people near you, which means catching anxiety from someone else is both real and measurable.
Why Your Brain Copies Other People’s Anxiety
Your brain contains specialized cells called mirror neurons that fire both when you perform an action and when you watch someone else perform it. These same circuits extend to emotions. In brain imaging studies, people who watched others display expressions of disgust showed activation in the same brain region (the anterior insula) as people who were directly experiencing something disgusting themselves. Your brain doesn’t just observe another person’s emotional state. It partially recreates it.
This mirroring system evolved for good reason. Reading the emotional states of people around you helped early humans detect threats, cooperate in groups, and respond to danger before it arrived. The problem is that the system doesn’t distinguish between “my partner is anxious about a real emergency” and “my coworker is spiraling about an email.” Your brain picks up the signal either way.
The Stress Response Is Physically Measurable
This isn’t just a feeling. Researchers at the Max Planck Institute and the University of Konstanz have measured it in the lab. In one study, 26% of people who simply observed someone else going through a stressful experience showed significant increases in cortisol, the body’s primary stress hormone. Among people watching a romantic partner under stress, that number jumped to 40%. Even watching a complete stranger triggered a measurable cortisol response in 10% of observers.
What’s particularly interesting is the timing. In one study, observers’ heart rates didn’t spike during the stressful event itself but increased afterward, suggesting the body initially freezes in response and then processes the stress on a delay. So you might feel fine while you’re around an anxious person, then notice the tension, racing thoughts, or tight chest hitting you 20 minutes later when you’re alone. Observers also showed increases in other stress markers that track nervous system activation, essentially mirroring the biological experience of the person who was actually in the stressful situation.
Some People Absorb More Than Others
Not everyone catches anxiety equally. Emotional closeness is one of the biggest factors. That 40% cortisol response rate for intimate partners versus 10% for strangers tells a clear story: the more you care about someone, the more porous your emotional boundary becomes. This is why a partner’s, parent’s, or close friend’s anxiety can feel so much more destabilizing than a coworker’s.
People with high empathy are also more susceptible. If you’ve always been the person others come to with their problems, if you tend to notice subtle shifts in someone’s mood, or if you find yourself physically drained after emotionally intense conversations, you likely have a nervous system that’s more tuned in to other people’s states. This sensitivity has real advantages in relationships and caregiving, but it also means you absorb more of what’s around you.
When Absorbing Becomes Depleting
There’s an important distinction between feeling momentary secondhand anxiety and a pattern of chronic emotional absorption. Neuroscientist Tania Singer’s research at the Max Planck Institute has shown that what people commonly call “compassion fatigue” is actually empathy fatigue. Compassion, the desire to help, doesn’t deplete you. What depletes you is when the boundary between your emotions and someone else’s blurs, and you take on their pain as your own.
This blurred boundary is called empathic distress. It’s a strong, aversive, self-focused response to someone else’s suffering. Instead of thinking “they’re struggling and I want to help,” you’re thinking “I can’t handle this, I need to get away.” The hallmark is that desire to withdraw. If you regularly feel the urge to flee from an anxious person you care about, not because you don’t care but because their anxiety feels unbearable in your own body, that’s empathic distress rather than simple empathy.
Repeated episodes of empathic distress over time can lead to genuine burnout: emotional exhaustion, withdrawal from the relationship, and a feeling that nothing you do makes a difference. This pattern shows up frequently in caregivers, partners of people with anxiety disorders, and anyone in a close relationship with a chronically anxious person.
How to Stop the Anxiety Transfer in the Moment
The first step is recognizing what’s happening. When you notice anxiety rising in your body, ask yourself: “Was I anxious before I walked into this room?” If the answer is no, you’re likely picking up someone else’s state. That simple recognition creates a sliver of distance between their emotion and your response to it.
Grounding techniques work well here because they pull your attention back into your own body and out of the other person’s emotional field. The 5-4-3-2-1 technique is one of the most reliable: name five things you can see, four you can touch, three you can hear, two you can smell, and one you can taste. This sounds almost too simple, but it works by flooding your brain with sensory data from your own present-moment experience, which interrupts the mirroring process.
Physical grounding can be even faster. Clench your fists tightly for a few seconds, then release them. The contrast between tension and release gives your nervous system something concrete to process. Structured breathing also helps. In 4-7-8 breathing, you inhale for four counts, hold for seven, and exhale for eight. The extended exhale activates the part of your nervous system responsible for calming down. You can do any of these without the other person noticing, which matters when you’re trying to stay present for someone who needs support.
If your mind is spiraling, try a cognitive reset: count backward from ten, recite something familiar, or silently repeat a grounding statement like “I am safe in this moment” or “This feeling is not mine.” These aren’t affirmations in the self-help sense. They’re attention redirectors that break the loop of mirrored anxiety.
Setting Boundaries Without Pulling Away
The challenge with secondhand anxiety is that it often involves people you love. You don’t want to abandon them, but you also can’t keep absorbing their emotional state without consequences. This is where the concept of differentiation becomes useful. Differentiation is the ability to stay emotionally connected to someone while maintaining a clear sense of where their feelings end and yours begin. People with higher differentiation experience less anxiety transfer even in highly stressful relationships.
Practically, this looks like staying present with someone’s anxiety without trying to fix it or absorb it. You can acknowledge what they’re going through (“I can see this is really hard for you”) while internally reminding yourself that their anxiety is not a problem you need to solve in your body. The goal is compassion without fusion.
When the pattern is chronic, verbal boundaries become necessary. A useful framework is to describe the situation without judgment, express how it affects you, and state what you need. For example: “When we spend our evenings talking through everything that’s worrying you, I notice I start carrying that stress too, and it’s affecting my sleep. I want to support you, but I need us to also have time together that isn’t about worry.” If someone texts you repeatedly while anxious, a response like “I’m with my family right now and can’t respond, but I believe you can work through this” validates their experience while protecting your space.
One useful reframe: instead of just reassuring an anxious person that everything will be fine (which often reinforces the cycle), express confidence in their ability to cope. “I get that this is hard for you, and I know you can handle it” does more for both of you than “Don’t worry about it.” It supports them without requiring you to take on the emotional weight yourself.
The Difference Between Empathy and Absorption
Healthy empathy means you can sense what someone else is feeling, respond with care, and then return to your own emotional baseline. Absorption means their feelings become your feelings, and you lose access to your own baseline entirely. The distinction matters because many people who struggle with secondhand anxiety believe they need to become less empathetic, when what they actually need is to become better at maintaining the boundary between self and other.
Singer’s research suggests that training yourself to respond with compassion (warmth and concern directed outward) rather than empathic distress (pain mirrored inward) is protective. In practice, this means noticing the moment when “I feel for them” shifts into “I feel like them,” and gently redirecting your attention. You can care deeply about someone’s suffering without replicating it in your own nervous system. That’s not coldness. It’s the only way to sustain being there for someone over the long term without burning out.