It's Probably Not the Sulfites: What's Actually Behind Your Wine Headache

For months, I’d scan the back of the wine bottle, spot the words “contains sulfites,” and immediately blame those for the pounding headache I’d get after two glasses of red. The label doesn’t lie. But my conclusion did. Sulfites are definitely in wine, but for most of us, they have nothing to do with the headache that follows.

This myth is one of the most stubborn in the wine world, and it’s not just harmless—it's expensive. I spent extra on “low-sulfite” bottles, convinced I was buying myself relief. I stopped drinking reds altogether, thinking they just didn’t agree with me, when in reality, there was a bigger story behind my symptoms. The real culprit might have been that third glass, skipping dinner, or a compound the label never mentions. So, I decided to dig a little deeper and figure out what’s really going on—because the truth is way more useful than the myth.

How three words on a label started a forty-year grudge

“Contains sulfites” is on American wine bottles because regulators wanted to protect certain people—mainly those with asthma—from allergic-type reactions. If wine has more than 10 parts per million of sulfites, it gets the label. But it doesn’t tell you how much. Whether the bottle barely crosses the threshold or maxes out, it’s the same warning. It’s a yes-or-no, not a danger rating, and it was never about headaches. Not once.

Here’s what changed my perspective: sulfites are everywhere in the grocery store. Wine is just the only product where most people notice them. Dried apricots, for example, often have sulfite levels more than a hundred times what’s in a glass of wine. Dried fruit, bottled lemon juice, and some deli items all have sulfites, but none carry the same stigma. Even salad bars used to be sprayed with sulfites to keep lettuce crisp—until that was banned in 1986 because of asthma reactions, not headaches.

So, a warning meant for a respiratory-sensitive minority turned into a universal “guilt label” for a symptom it was never shown to cause. Decades later, people (myself included) still see “contains sulfites” and assume that’s what got us. But that’s not the real story—and I wanted to know more about what actually does.

What sulfites actually do—and who actually reacts

Sulfur dioxide in wine acts as both an antioxidant and antimicrobial. It prevents wine from oxidizing and keeps bacteria and wild yeast at bay. Winemakers have used sulfur since Roman times—it’s not some modern shortcut. And here’s the kicker: wine naturally makes its own sulfites during fermentation, so there’s no such thing as truly sulfite-free wine. Bottles labeled “no sulfites added” still have them; just not beyond what fermentation produced. Most wines are well below the legal limit.

Some people really do react to sulfites, and it’s mostly those with asthma. About 5% of asthmatics experience respiratory issues—wheezing, chest tightness—not headaches. Usually, if sulfites are a problem, you’ll see symptoms after eating dried fruit or drinking lemonade, not just wine. A respiratory reaction isn’t the same as a headache, but the myth blurs the line.

The white-wine problem with the theory

Here’s the fact that made me rethink everything: if sulfites caused wine headaches, then white wine should be the main suspect. White and sweet wines have more added sulfites than reds. Reds have built-in protection (tannins and pigment), so they need less sulfur. Sweet wines need extra because sugar invites bacteria. So, bottle for bottle, whites and dessert wines usually have more sulfites than reds.

And yet, when I ask people about wine headaches, everyone mentions red. “Red wine headache” is a common phrase—“white wine headache” isn’t. If the compound blamed is more abundant in wines nobody blames, the theory falls apart. That mismatch was my lightbulb moment.

So what’s actually behind the headache?

If it’s not sulfites, then what? Wine headaches aren’t caused by just one thing—they’re a mix of factors. Which one gets you depends on your body and your bottle.

The most intriguing new suspect is quercetin, a flavonol from grape skins, abundant in red wine. Once it hits your bloodstream, your body turns it into quercetin glucuronide, which inhibits the enzyme ALDH2. That’s the enzyme responsible for clearing acetaldehyde—a toxic byproduct of alcohol breakdown. If acetaldehyde builds up, you get flushing, nausea, and headache. The theory is that red wine, rich in quercetin, temporarily sabotages your ability to detox alcohol, explaining the red-specific pattern.

Then there’s histamine. Fermentation produces biogenic amines like histamine, and because reds are fermented with the skins, they contain more. Histamine dilates blood vessels—a known headache trigger—and some people don’t break it down well. For them, a histamine-heavy red wine is trouble.

Tyramine, another biogenic amine, can also influence blood pressure, another headache mechanism.

And let’s not forget alcohol itself. Alcohol is a diuretic and vasodilator—it dries you out and widens your blood vessels, both of which can cause headaches. Sometimes, what we call a “wine headache” is just an early hangover, especially after three quick glasses on an empty stomach. That’s been my experience more times than I care to admit.

So, the takeaway isn’t to blame a new compound. The truth is, wine headaches are probably some moving mix of acetaldehyde, biogenic amines, dehydration, and sheer volume and pace—different for each person and each night. It’s messy, but it fits reality much better than any label ever could.

“But natural wine never does this to me”

Here’s another thing I hear—and have felt myself: I drink “natural” wine and feel fine, so I assume it’s the added sulfites that caused trouble. But I realized it’s not that simple. Natural and low-intervention wines usually have less added sulfur, but they also differ in alcohol content, setting, and pacing. I tend to sip these wines more slowly, often with food, and in a more relaxed setting. Plus, if I expect to feel better, that expectation alone can make a difference. Ironically, because natural wines use less sulfur and filtration, they sometimes have higher biogenic amines like histamine—the compounds more likely to cause headaches. So, “I feel fine on natural wine” isn’t the clean experiment it seems—too many variables moved at once.

The honest caveat: the science is not fully settled

I have to admit, the science isn’t totally settled. There’s some evidence that, in a small group of people who already have a history of wine-triggered headaches, higher sulfite concentrations might raise headache risk. But for most of us, sulfites are not the cause. The real mistake is thinking a narrow, asthma-linked sensitivity plus a regulatory label explains a universal symptom.

The fair summary, in my experience? For most wine drinkers, sulfites aren’t behind the headache. For a small, susceptible group, it can’t be ruled out. “It’s not the sulfites” is true for the majority; “it’s never the sulfites for anyone” goes too far.

What to actually do about it

Here’s the part that changed how I shop and drink wine—what this information is actually worth at the store and dinner table.

I stopped paying more for “no sulfites added.” There’s sulfites in the wine anyway, and I’m not buying headache insurance. If I love a low-intervention wine for its taste or story, I buy it for those reasons—not for relief.

I became my own experiment. When a wine treated me badly, I started jotting down the details: red or white, grape type, alcohol percentage, how much I drank, how fast, and whether I had eaten. A few notes later, patterns emerged that were way more helpful than any general theory. Sometimes it was always the higher-alcohol reds. Sometimes, only when I skipped dinner. My own log beats folklore every time.

I drink water and eat food. Not glamorous, but effective. A glass of water between pours, and a meal in my stomach, does more to prevent headaches than anything else.

I pay attention to the alcohol number. A 15.5% Zinfandel is very different from a 12.5% Loire red. If reds tend to hurt, I try lower-alcohol, lighter-bodied ones before giving up on them altogether.

I use the red-vs-white signal. If reds reliably cause headaches and whites don’t, that points to quercetin or histamine—compounds from grape skins. I experiment with lighter reds (like Gamay or Pinot Noir) before deciding that red wine is off-limits.

And if a bottle or style consistently wrecks me, I just stop drinking it. I don’t owe any wine a second chance. My goal is to drink in a way that feels good and lets me enjoy the glass.

The exception? If you suspect genuine sulfite sensitivity—especially if you have asthma and experience respiratory issues, not just headaches—that’s a conversation to have with your doctor, not just a guess at the wine aisle.

Where I think this is heading

With new quercetin research underway, we might soon be able to predict which red wines are more likely to cause headaches based on grape, growing conditions, and winemaking. That would be incredibly useful—finally, a way to pinpoint the real problem instead of fearing a label.

Until then, I don’t obsess over “contains sulfites” as if it’s a hazard rating. I pay attention to my own glass—what I drank, how much, how fast, with what food, and how I felt afterward.