Grief comes in waves because your brain doesn’t process loss in a straight line. It moves between confronting the pain and pulling back from it, sometimes within the same hour. A song, a smell, or even a quiet Tuesday afternoon can suddenly activate the same emotional circuits that fired in the first days after your loss. This isn’t a sign that something is wrong with you. It’s how the brain adapts to the absence of someone it was deeply bonded to.
Your Brain Oscillates Between Grief and Recovery
One of the most useful frameworks for understanding grief waves comes from bereavement researchers Margaret Stroebe and Henk Schut, who developed what’s called the Dual Process Model. It identifies two types of stress that grieving people face: loss-oriented stress (the pain of missing someone, replaying memories, crying) and restoration-oriented stress (figuring out how to pay bills they used to handle, navigating social situations alone, rebuilding routines).
The key insight is that healthy grieving involves oscillating between these two states. You don’t sit in one and work through it before moving to the other. Instead, your mind naturally swings back and forth, sometimes confronting the loss head-on and sometimes avoiding it entirely to deal with the practical demands of being alive. This oscillation is why you can feel fine making dinner and then be leveled by grief when you reach for a mug they always used. Your brain needs “dosage” of grieving, meaning it takes breaks from the pain not because you’re avoiding it, but because rest is a necessary part of processing it.
Why Certain Moments Trigger a Wave
The part of your brain that processes emotions and forms emotional memories, the amygdala, is deeply involved in grief. When you encounter something associated with the person you lost, the amygdala fires rapidly, often before your conscious mind has even registered what happened. Brain imaging studies show heightened amygdala activation in grieving people when they’re exposed to reminders of their loss, and this activation connects directly to the areas responsible for memory consolidation and recall.
Smell is an especially powerful trigger. Unlike your other senses, your sense of smell has a direct neural pathway to the brain regions that handle emotion and associative learning. Most sensory information gets routed through a relay station in the brain first, but olfactory signals bypass that step and land right in the emotional processing center. Studies have shown that memories triggered by smell are more emotionally intense, more vivid, and more likely to transport you back to the original time and place than memories triggered by sight or sound. This is why catching a whiff of someone’s perfume or their laundry detergent can produce a grief wave that feels as raw as the first week.
Visual and auditory cues work similarly, just with slightly less intensity. A laugh that sounds like theirs, their handwriting on an old grocery list, a place you used to go together. Each of these activates the brain’s emotional memory system and produces a surge of feeling that can seem wildly out of proportion to the trigger itself.
The Chemistry of Yearning
Grief waves often carry a specific, aching quality: yearning. That desperate wish for the person to be there again. This feeling has a biological basis rooted in the same brain systems that created your bond in the first place.
When you’re closely attached to someone, your brain maintains that bond partly through oxytocin (involved in social bonding) and the body’s natural opioid system. When that person is suddenly gone, those chemical signals drop. Animal studies on pair-bonded prairie voles show that separation from a partner causes oxytocin levels to fall in the brain’s reward center, producing a depressive-like response. Your brain, in a sense, is experiencing withdrawal from a person.
At the same time, brain imaging reveals something striking: in grieving people, the amygdala activates simultaneously with reward-oriented areas of the brain. Your emotional system is processing pain while your reward system is still searching for the connection it used to get. This tug-of-war between pain and longing is part of what makes grief waves feel so disorienting. You’re not just sad. You’re sad and reaching for something your brain hasn’t fully accepted is gone.
The Ball in the Box
One of the most widely shared explanations for why grief waves change over time came from a woman named Lauren Herschel, who posted an analogy her doctor shared after she lost her mother. Imagine a box with a button inside it, and a ball bouncing around in that box. The button is your pain. Early in grief, the ball is enormous. It fills nearly the entire box, pressing the pain button constantly. Every movement, every thought, every moment of the day hits it. There’s almost no space between waves because the ball barely has room to move without triggering pain.
Over time, the ball shrinks. It doesn’t disappear, but it gets smaller, so it bounces around the box and hits the button less often. When it does hit, though, the pain can be just as sharp as it was at the beginning. This is why you can go days or weeks feeling relatively stable and then get blindsided by a wave that feels like day one. The ball just happened to hit the button.
Grief Stays the Same Size
Many people expect that grief itself will shrink over time, that the pain will gradually fade until it’s a small, manageable thing. Grief counselor Lois Tonkin found something different. A bereaved mother told Tonkin that her grief hadn’t gotten smaller at all. It was just as big and just as intense as when her child first died. But her life had grown around it.
Tonkin’s “growing around grief” model captures what most bereaved people actually experience. The grief stays the same size. There are still days when it fills everything, when a wave hits and you feel the full force of the loss as though it just happened. But over time, your life expands to include new experiences, routines, relationships, and moments of genuine enjoyment that exist alongside the grief. You don’t get over it. You grow a larger life that contains it.
This is why grief waves can still catch you years or even decades after a loss. The grief hasn’t gone anywhere. You’ve simply built more life around it, so the waves come less frequently. When they do come, they can still take your breath away, and that’s normal.
What Helps When a Wave Hits
Because grief waves are often triggered suddenly and feel overwhelming in the moment, having a few concrete strategies can make the difference between riding the wave and feeling like you’re drowning in it.
Physical expression helps. Crying, writing in a journal, even screaming into a pillow gives the emotional surge somewhere to go. Grief often shows up in the body as tension, fatigue, chest tightness, or stomach pain, so paying attention to where you’re holding it physically can help you release it. Gentle movement like walking or stretching can also shift your nervous system out of the acute stress response and into a calmer state.
The Dual Process Model also suggests that it’s healthy to step away from grief deliberately. Watching something funny, doing a task that requires focus, spending time with someone who makes you feel normal: these aren’t signs of denial. They’re part of how your brain processes loss in manageable doses. You don’t need to force yourself to sit in every wave until it passes. Sometimes the healthiest thing you can do is let yourself be distracted for a while.
When Waves Don’t Change Over Time
For most people, grief waves gradually become less frequent even though they don’t become less intense. But for some, the waves remain constant and consuming for a year or more, making it difficult to function. This is recognized clinically as prolonged grief disorder.
The diagnostic threshold requires at least 12 months to have passed since the loss, along with persistent, daily yearning for the deceased person or preoccupation with thoughts of them, plus at least three additional symptoms: feeling like part of yourself has died, a marked sense of disbelief about the death, avoidance of reminders, intense emotional pain, difficulty reengaging with life, emotional numbness, feeling that life is meaningless, or intense loneliness. These symptoms need to be present nearly every day and cause significant difficulty in daily functioning.
This isn’t about judging whether someone is grieving “too much.” Cultural and religious contexts shape what a normal grieving period looks like, and those differences are explicitly recognized in the criteria. The distinction is about whether the waves have stayed so large and so constant that the ball has never shrunk at all, and whether that’s preventing you from building any life around the grief. Prolonged grief disorder responds to specific therapeutic approaches, and identifying it is the first step toward getting the right kind of support.