Giardia While Traveling: How to Recognize It, Treat It, and Stop Waiting It Out

Two of the most important meds for travelers. The one on the bottom, Tinidazole, is effective against giardia

If you’re currently sick on the road and just want the practical information, skip ahead to the section titled How to Tell If You Might Have Giardia. I won’t be offended. I’ll still be here. Probably near a bathroom.

Important disclaimer up front:

I am not a medical doctor. I am a doctor of other things, but not the kind who gets to write prescriptions or wear a stethoscope without people getting nervous. This post contains a summary of the medical advice I’ve received—multiple times now—from actual medical professionals, plus what worked for us on the road. But this is simply what we did. Talk to a medical doctor about giardia if you think you may have contracted it, or if you are concerned you may contract it.

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A Mental Lapse, Told in Burps

The third time I got giardia, a nasty little parasite, I was in Central Asia.

It all started with a warning sign that was so clear, so obvious, so neon-lit and blinking that it should have come with a siren.

I missed it completely.

The first clue was a burp that very distinctly tasted like old eggs. Not “hmm, maybe eggs?” Not “this reminds me of breakfast.” No. This was a full-commitment sulfur burp, the kind that makes you pause mid-thought and silently reassess place in the universe. And how you feel about eggs.

Important note: burps should not clearly taste like old eggs. That is not a thing that happens in healthy, well-adjusted digestive systems.

But I had eaten eggs for breakfast, so I did what anyone excited to get out there and explore a new city would do: I shrugged and assumed my morning meal was, uh… resurfacing. Gently. But also with enthusiasm. I did not think much more of it . . . because I am not a smart man.

Later that day, things escalated.

I found myself participating in one of travel’s most time-honored traditions: the urgent, dignity-abandoning sprint in search of a toilet. And sprint I did. This was not a casual walk. This was a “clear the runway” situation.

Still, I remained calm. Because travelers’ diarrhea is practically a rite of passage. It happens to everyone. It happens to careful travelers. It happens to people who bring hand sanitizer, water purification tablets, and an unjustified sense of confidence. So again, I shrugged. This is travel, I told myself. This is just part of the deal.

Then came the final act.

I woke up one morning to find my wife sitting very still, looking pale and hollow-eyed, like someone who had stared directly into the abyss—and the abyss had stared back, from inside her digestive tract.

She looked at me and said, in a voice heavy with quiet despair:

“I have diarrhea. And egg burps.”

And in that moment—like a monk achieving sudden enlightenment, or a cartoon character finally noticing the anvil above their head—it all clicked.

The burps.

The running.

The shared misery.

It hit me with the full weight of a microscopic parasite.

We didn’t just have travelers’ diarrhea.

We had giardia.

How I Should Have Known (Three Times Now)

I should have known from the very first moment—when that sulfur-tinged, old-egg burp bubbled up from deep inside me—that I was probably dealing with giardia.

After all, this was not my first time playing unwilling Airbnb host to these evil little gut busters.

The first time I caught giardia was while backpacking in Wyoming’s Wind River Mountains. I had, of course, treated all my water on that week-long trip. I was careful. I was responsible. I was smug about it.

And yet, somewhere along the way, I must have slipped up.

What followed was a week spent under the crushing weight of diarrhea, vomiting, and sulfur burps so aggressive they could be detected by anyone unfortunate enough to share the same enclosed space. It was miserable. It was humbling. It was my formal introduction to giardia.

Years later, I was on a white-water rafting trip on the Ganges River near Rishikesh, India. Part of the fun of the trip involved jumping out of the raft and navigating rapids with nothing but a life jacket, a helmet, and wildly misplaced optimism to keep me alive.

Of course I knew better than to let any Ganges water into my mouth. Of course I was careful. And of course, a week or so later, the familiar trio returned: egg burps, diarrhea, and vomiting—like an unwanted reunion tour.

So yes, by the time Central Asia rolled around, I probably should have recognized the symptoms immediately.

But I didn’t.

And that’s exactly why I want you to be able to do better.

A Very Short Introduction to Giardia while Travelling (a Parasite You Never Wanted to Meet)

Giardia is not a virus. It’s not a bacteria. It’s not food poisoning.

Giardia is a microscopic parasite—a single-celled menace—that takes up residence in your small intestine and then proceeds to behave like it owns the place.

It spreads through contaminated water and food, usually via what scientists delicately call the fecal–oral route, which is a polite way of saying: someone, somewhere, didn’t wash their hands well enough, and now you’re involved.

You can pick it up by:

• Drinking untreated or poorly treated water

• Swallowing a little water while swimming or rafting (yes, even accidentally)

• Eating food washed or prepared with contaminated water

• Touching your mouth after touching something contaminated

And here’s the key thing: you don’t need to do anything obviously reckless to get it. You don’t have to chug river water or lick a bus station floor. Giardia is sneaky. It survives in cold water. It laughs at weak filtration. It waits patiently for you to slip up just once.

Once inside you, giardia doesn’t usually knock politely. Symptoms often show up one to two weeks later (although symptoms can show up in just a few days), long after you’ve forgotten about that one questionable glass of water or that otherwise innocent swim. Which is part of why so many travelers don’t recognize it for what it is.

So let’s talk about what giardia actually feels like—and how to tell when it’s time to stop waiting it out.

A roadside stand in Tajikistan utilizing an ingenious systems to keep beverages cool. Meltwater from the mountains was channelled into pipes peppered with drain holes to keep icy water constantly pouring over the bottles of beverages. Of course, that water could have been contaminated with giardia and it would have been easy to accidentally drink a little. This was probably not the culprit in our cases, but giardia can be sneaky

How to Tell If You Might Have Giardia (and Not Just Routine Traveler’s Diarrhea)

What Giardia Actually Feels Like

The tricky thing is how to distinguish giardia from other types of traveler’s diarrhea.

One hallmark symptom—the one that should make you pause mid-trip and say “wait… this feels familiar” if you have ever had giardia before—is sulfur burps. I’m talking about burps that unmistakably taste and smell like old eggs that have been left in the sun.

That alone should raise suspicion.

Add to that:

• Persistent, watery diarrhea that just … keeps going. Sometimes described as “greasy” (shudder!!!). Tends to be pale, or frothy (I know, I know. It is hard to write this post without getting a bit graphic!)

• Bloating that makes you feel like you swallowed a beach ball

• Nausea, sometimes vomiting

• Fatigue that feels out of proportion to your activity level

And here’s the key difference from most food poisoning: giardia lingers. You don’t get violently ill for 24 hours and then bounce back. Instead, you feel moderately awful for days, sometimes weeks, slowly wondering if this is just your life now.

Why People Think It’s Just Traveler’s Diarrhea

Most of the time you get sick on the road, it is just traveler’s diarrhea.

Traveler’s diarrhea is common, boring, and usually short-lived. You get it, you suffer a bit, you hydrate, you move on. So when giardia shows up wearing a similar outfit—diarrhea, stomach issues, general misery—most travelers assume it’s the same thing and try to wait it out.

Also:

• Giardia doesn’t always hit immediately; symptoms can appear days or even weeks after exposure. Some people contract giardia but never show symptoms.

• People expect parasites to feel dramatic and exotic, not annoyingly persistent

• No one wants to believe they’re hosting a microscopic freeloader

So travelers keep pushing on, popping rehydration salts, telling themselves tomorrow will be better. And sometimes tomorrow is better. But with giardia, often it’s just… the same.

Or worse. Without treatment, giardia can last weeks.

When to Stop Waiting It Out

Here’s the practical rule of thumb I wish someone had drilled into my head earlier:

If you’ve had diarrhea lasting more than 4-5 days and/or accompanied by sulfur burps, especially with bloating and fatigue, stop waiting it out.

At that point:

• It’s probably not standard traveler’s diarrhea

• Your body is not “almost done”

• And hydration alone is not going to fix it

Giardia is very treatable, but it almost never resolves quickly on its own. The sooner you recognize it, the sooner you can take the appropriate medication and get your life back—ideally before planning your day around bathroom access and apologizing to your travel companions.

Treatment: How Giardia Is Usually Dealt With (From Someone Who Is Not a Medical Doctor)

If you travel regularly (especially to places where water sanitation can be inconsistent), I strongly recommend seeing a travel doctor before you go. And when you do, ask them specifically about giardia. It’s a common travel illness, and a good travel clinic will be very familiar with it.

The Two Common Medications

Giardia is usually treated with antiparasitic medications. The two you’ll hear about most often are:

Tinidazole

This is often the first choice these days. It’s typically taken as a single dose, which is great when you’re traveling, exhausted, and would prefer not to remember to take pills for a week.

Metronidazole (Flagyl)

This is the older, very well-established option. It usually involves a multi-day course (often 5–7 days). It works very well, but comes with a few caveats:

• You absolutely cannot drink alcohol while taking it (or shortly after), unless you enjoy instant regret.

• It can leave a metallic taste in your mouth that makes everything taste like disappointment. However, we did not experience this at all, so it is not guaranteed.

Both medications are widely used and effective when taken correctly—but which one is appropriate, and at what dosage, is something a medical professional should advise you on.

Getting the Medication: Before You Go vs. On the Road

In most of North America and Europe, you’ll need a prescription for either of these medications. The good news is that many travel doctors (and often general family doctors) are willing to prescribe them in advance, specifically so you can carry them with you “just in case.”

This is honestly the easiest option. You won’t have to hunt down a pharmacy while feeling like garbage. Bonus: you don’t have to explain “egg burps” through hand gestures and Google Translate.

That said, in many countries, these medications are available without a prescription.

In our case, when we were in Tajikistan, no prescription was required at all. Even though we were in a relatively remote town on the Pamir Highway (Kalaikhum), we walked into a small pharmacy, explained the symptoms, and walked out with metronidazole for both of us.

Total cost: 24 somani.

That’s about $2.50 USD.

For that price, our giardia packed its bags and left remarkably quickly.

Note: while these meds are effective, they are not 100% so. A few weeks after my symptoms had subsided, they began to reemerge. If you experience this, you should consult a medical professional. I just took another dose of the meds, and all was good.

The Pamir Highway Giardia Support Group (Unofficial, Unlicensed, and Highly Effective)

One of the funny things about traveling somewhere remote—like the Pamir Highway—is that you keep running into the same people. There are only so many roads, only so many guesthouses, and only so many places to sit around waiting for a landslide to clear. So you start recognizing faces. You share meals. You swap border stories. And, inevitably, you talk about bodily functions.

Yes, diarrhea is considered a perfectly acceptable topic of conversation among adventure travelers. It’s right up there with the weather.

Over the course of several days, we met multiple travelers who complained—sometimes casually, sometimes with despair—about constant diarrhea and sulfur burps. The egg burps. Always the egg burps. At this point, Michelle and I didn’t even hesitate.

“Oh,” we said, with the calm confidence of people who had already suffered.“Yep. You probably have giardia.”

We told them about our experience and the meds we had used. We explained that no, this probably wasn’t just something they ate yesterday. And then we went our separate ways.

A few days later, we ran into some of the same travelers again.

They were radiant.

They thanked us like we had pulled them from a burning building. The medication had worked almost immediately. Symptoms they’d been dealing with for weeks—sometimes longer—were gone. Just… gone. What they had assumed was an endless loop of “bad travel stomach” turned out to be a very specific, very treatable parasite.

There are a couple of important lessons buried in this very unglamorous story.

First: giardia seems to be remarkably common in Central Asia. Michelle and I are careful travelers. We live by the “peel it, cook it, or forget it” rule. We brush our teeth with bottled water. We avoid sketchy ice. And we still both got hit. Add to that the number of travelers who openly told us about their symptoms, and it’s reasonable to assume there were others suffering silently—either too polite, too embarrassed, or too exhausted to announce their digestive distress to strangers.

Second: most people simply don’t know what giardia feels like, so they don’t realize what they’re dealing with. They assume it’s just traveler’s diarrhea that will eventually pass. So they wait. And wait. And suffer. And slowly forget what it feels like to trust a fart.

A little knowledge goes a long way here. In this case, it turned weeks of misery into a short pharmacy visit and a rapid return to feeling human.

Which is why recognizing the symptoms—and knowing when to stop waiting it out—might be one of the most useful travel skills you ever pick up.

A Final, Uncomfortable Thought

Giardia is not the kind of souvenir you hope to bring home. It really doesn’t photograph well. It doesn’t make for heroic dinner stories. And yet, if you travel long enough—especially to beautiful, remote, infrastructure-light places—it is very much part of the deal.

The good news is that giardia is knowable. It has patterns. It has tells. And most importantly, it has a fix. The bad news is that too many travelers suffer far longer than they need to because they assume misery is just the price of admission.

It isn’t.

If this post helps even one person recognize those sulfurous warning signs early, and reclaim their dignity (and their appetite), then all of this public oversharing will have been worth it.

Travel will always involve risk. Sometimes that risk looks like a sketchy mountain road or a questionable ferry. Sometimes it looks like a burp that should not, under any circumstances, taste like eggs.

Pay attention. Take care of yourself. Learn from other people’s mistakes—especially mine.

Because traveling well requires a modicum of health.