Almost everyone can name someone who leaves them flattened. You hang up the phone, or walk out of the coffee, and you feel like you have run a small race you did not enter. The internet has a tidy label for these people, the energy vampire, and it is a satisfying phrase precisely because it puts all the blame on them and none on you. But the science of why some interactions deplete us is more interesting, and more useful, than the vampire story, in part because it turns out we are often half the reason. Here is what actually drains, according to the research, and what the same research quietly suggests about it being less one-sided than it feels.

The first mechanism is not metaphorical. Emotions are contagious in a fairly literal sense, and this is one of the better-established findings in social psychology. In a much-cited set of experiments, the organizational researcher Sigal Barsade planted a trained actor in small work groups and had that person carry a particular mood into the room. The mood spread. Group members caught the emotion the actor was projecting, measurable both in their own reports and in ratings by observers who did not know the setup, and negative emotion in particular rippled outward and worsened cooperation and the group’s sense of how well it was doing.

Barsade called it the ripple effect, and the everyday version is obvious once you notice it. Sit with someone who is anxious and you tense up. Spend an hour with someone steeped in complaint and contempt and you leave carrying a residue of it. The draining is real, and it is partly a transfer: their state becomes, chemically and behaviorally, a little bit yours. Some people simply run a more negative signal, and being near it is genuinely costly.

The second mechanism is sneakier, because it wears the disguise of friendship. The psychologist Amanda Rose has spent years studying what she named co-rumination, the habit of two people going over a problem again and again, rehashing every detail, speculating endlessly about causes, and circling back to the same bad feelings without ever moving toward a resolution. Rose found that co-rumination is a genuine paradox: it makes friends feel closer, and it also predicts higher anxiety and depression over time, because the endless rehearsal of a problem deepens the rut rather than digging you out of it.

This is where the vampire framing starts to fall apart. Co-rumination takes two. The friend who calls to relitigate the same grievance for the fifth time is draining, yes, but the dynamic only runs because the other person keeps feeding it with sympathetic questions that pull out more problem talk. Some of the most depleting relationships are not predator and victim but two people locked in a loop that leaves them both flatter than when they started. Recognizing that is more empowering than blaming, because it points at something you can actually change.

A third source of drain is simple imbalance. Relationships run on a rough reciprocity, an unspoken sense that support flows both ways over time. The person who treats you purely as a service, an emotional dumping ground who never asks how you are, breaks that contract. Every interaction is a withdrawal and none is a deposit.

Psychologists talk about the effort of managing and absorbing other people’s feelings as a real form of labor, and labor is depleting whether or not anyone acknowledges it. When one person does all of it, being cheerful for someone who is never cheerful for them, staying calm so the other can be agitated, the account slowly empties. The tiredness you feel is the accurate reading of a ledger that only runs in one direction.

Here the fairness has to cut the other way too, because the drained person is not always the innocent party, and the label can be cruelly wrong. Sometimes the person who exhausts you is not a manipulator but someone in genuine difficulty, struggling with depression or a hard stretch of life, and what feels like them draining you is really them needing more than you can give right now. Calling that person an energy vampire is both inaccurate and unkind. The tiredness is real, but the remedy is a boundary held with compassion, not a diagnosis flung at someone who is suffering.

Fit matters as well. The same person who flattens you might energize someone else, because energy in relationships is relational, not a fixed property one party carries around. A high-intensity talker drains a quiet person and delights another high-intensity talker. Before deciding someone is objectively draining, it is worth asking whether the problem is them, or the particular chemistry between you, or a season in your own life when your reserves happen to be low. The honest answer is often some mixture, and that mixture is not a character verdict on anyone.

The mechanisms point to their own remedies. If moods are contagious, then some deliberate distance around chronically negative people is not coldness but basic hygiene, the emotional equivalent of not sitting in a draft. If co-rumination is the trap, the fix is not to abandon the friend but to change your own move: to listen once, then gently steer toward what might actually help rather than feeding another lap of the same complaint. And if the ledger is one-sided, the repair is to stop quietly covering the imbalance and let the relationship rebalance or reveal itself.

None of this requires the drama of cutting people off or the smugness of labeling them. It requires noticing which mechanism is running, and adjusting your part in it.

So the feeling of being drained is not imaginary, and the research takes it seriously: emotions really do transfer, problem loops really do deepen distress, and one-way relationships really do empty you out. What the science adds is the part the vampire story leaves out. Draining is usually a dynamic, not an attack, and dynamics have two ends. That is not bad news. It means the most tired-making relationships in your life are also, often, the ones you have the most quiet power to change, starting with the end of the loop you happen to be holding.