Is brushing my teeth with tap water safe when traveling?

It is usually lower risk than drinking tap water because you swallow less, but it is not risk-free. If you are traveling somewhere with uncertain water safety, consider using bottled or treated water for brushing when feasible.

Why are ice cubes such a big deal for traveler’s diarrhea?

Ice cubes may be made from local tap water, which can carry bacteria, viruses, or parasites. Even if the drink itself is bottled, contaminated ice can still expose you.

Should I take antibiotics before I get sick to prevent traveler’s diarrhea?

Routine preventive antibiotics are generally not recommended because they can cause side effects, disrupt the gut microbiome, and contribute to antibiotic resistance. Ask a clinician whether carrying a standby prescription makes sense for your itinerary and health risks.

How long is too long for traveler’s diarrhea?

Many cases start improving within a few days. If diarrhea lasts more than about a week, or if there is blood in the stool, high fever, fainting, or signs of dehydration, it is a reason to seek medical advice.

How to Avoid Traveler’s Diarrhea on Vacation

Why do I always get diarrhea when I travel?

“Am I going to spend my whole trip in the bathroom?”

That’s the puzzle at the center of traveler’s diarrhea, it can feel random, unfair, and almost inevitable when you visit places where the water, food handling, or sanitation standards differ from what your gut is used to.

The framing in this video is refreshingly practical: traveler’s diarrhea is common, usually short-lived, and mostly about managing risk rather than chasing a perfect guarantee. The infectious disease expert brought in for the discussion describes it as an infection you “acquire,” often in tropical countries, most commonly from bacteria like E. coli.

The key idea is not that the destination is “dirty” in a moral sense. It’s that you are being exposed to microbes your body is not adapted to, through water, food, hands, and surfaces.

Did you know? Traveler’s diarrhea affects an estimated 30% to 70% of travelers, depending on destination and season, according to the CDC Yellow BookTrusted Source.

That wide range matters. It reinforces the video’s “Russian roulette” theme, risk is real, but it is not identical for every trip or every person.

What’s actually happening in your gut (and why dehydration is the danger)

Traveler’s diarrhea is usually an infection of the gastrointestinal tract.

A question raised in the conversation is one many people have: “Isn’t our GI tract already full of bacteria?” Yes, but the problem is that some strains carry toxins that change how your intestines handle fluid. Instead of absorbing water normally, the bowel starts secreting water into the gut, essentially dumping fluid into the stool.

This is why diarrhea can come on fast and be very watery. It is not only your body “flushing things out,” it is also the microbe’s toxins disrupting the normal fluid balance.

In many cases, symptoms improve on their own within about 2 to 3 days, which matches public health guidance that many episodes are self-limited. The CDCTrusted Source also emphasizes that most cases are mild to moderate, but can still derail travel plans.

The real risk highlighted in the video is dehydration.

When you lose water, you also lose electrolytes (like sodium and potassium) that your nerves, muscles, and heart rely on. The expert points out that severe fluid and electrolyte losses can become dangerous and, in extreme situations, even fatal. The discussion also underscores who is most vulnerable: young children, older adults, and people who are immunocompromised.

A tricky “catch-22” comes up: people often get traveler’s diarrhea from the local water, then they need to rehydrate, but safe water may be harder to access. That is why planning ahead matters.

Important: If you cannot keep fluids down, feel unusually drowsy, faint, confused, or dramatically weaker than expected, dehydration may be escalating. In that situation, it is safer to seek urgent medical help rather than trying to tough it out.

How can E. coli affect more than the gut?

The video notes that “toxic types” of E. coli exist, and toxins can sometimes affect other organs.

One well-known example is Shiga toxin producing E. coli, which can lead to serious complications in some cases. While most traveler’s diarrhea is uncomplicated, this is a reminder not to assume every episode is harmless, especially if there is blood in the stool or severe illness.

For a deeper overview of causes and risks, the Mayo Clinic’s traveler’s diarrhea pageTrusted Source explains common pathogens and why prevention focuses on food and water safety.

When it’s “normal,” and when it’s a red flag

Most people want one clear rule: “How long do I wait before I worry?”

The video’s answer is grounded in patterns clinicians use every day. Many cases are miserable but short, often 2 to 3 days, then gradual improvement.

But some features are not “typical travel diarrhea.” Those are the moments to consider medical care.

Red flags highlighted in the discussion include:

Blood in the diarrhea. Blood can signal a more invasive infection and should not be ignored.

Symptoms lasting more than 7 days. That is beyond the usual short, self-limited course discussed, and it raises the possibility of different pathogens or complications.

High fever, fainting, or severe weakness. These can reflect dehydration, systemic illness, or both.

Extremes of age or higher risk health status. Young kids, older adults, and immunocompromised travelers can worsen faster.

A helpful way to think about this is “trajectory.” If you are not slowly trending better after a couple days, or you are trending worse, reassess.

Pro Tip: Before you travel, look up where you would get care at your destination (hotel clinic, urgent care, hospital) and save the address offline. When you feel awful, you do not want to start that search from scratch.

Q: When should I stop self-treating and contact a doctor while traveling?

A: If you see blood in your stool, have a high fever, are passing out, cannot keep fluids down, or symptoms persist beyond about a week, it is time to get medical advice. It is also wise to seek help sooner for infants, older adults, and anyone with immune suppression or significant chronic illness.

Dr. Tom Warren, Infectious Disease Expert (as featured in the video)

Prevention, the video’s “Russian roulette” risk-reduction plan

The prevention strategy here is not “be perfect.” It is “reduce the number of risky exposures.”

The expert uses a memorable phrase when asked about brushing teeth with tap water: it is “a little bit of Russian roulette.” That captures the reality that risk is never zero, but you can lower it.

Start with water, because it’s the most common trap

A travel day often includes water in multiple forms, not just what you drink.

Here is the practical hierarchy discussed, from safer to riskier.

Choose sealed bottled beverages when you can. This is the straightforward move for many destinations. The point is not that bottled is always perfect, but it is often safer than tap water when sanitation is uncertain.

Watch the ice cubes. This is the “sneaky” risk the video keeps coming back to. You can order a bottled drink and still get exposed if ice was made from tap water.

Brushing teeth with tap water is usually lower risk than drinking it, but not risk-free. The video treats this as a calculated choice, you are exposed to less water, but the bacteria may still be present.

Short version: water is not just what you swallow from a glass.

»MORE: Build a one-page “hydration plan” for your trip, including where you will get safe fluids, oral rehydration solution packets, and backup options if shops are closed.

Food choices that matter most (especially produce and undercooked meat)

The discussion highlights two classic sources: raw produce washed with local water and undercooked meat.

Be cautious with fresh vegetables and salads. If produce was washed with tap water, you can be exposed even if you never drink tap water directly.

Avoid undercooked meat, especially ground meat. The video uses the example of an undercooked burger as a potential source of E. coli.

Pick reputable establishments when possible. This is not a guarantee, but it is a practical filter. Higher turnover and better food handling practices can reduce risk.

A common public health summary is “boil it, cook it, peel it, or forget it.” The CDCTrusted Source has a detailed food and water safety guide that aligns with the video’s emphasis on water, raw produce, and careful food selection.

Hand hygiene, the boring step that works

Handwashing comes up near the end of the video for a reason.

Even if you are careful about food and water, your hands touch menus, money, railings, and bathroom surfaces. Then they touch your mouth.

Wash with soap and water when available, especially before eating.

If soap and water are not available, use alcohol-based hand sanitizer, and cover all surfaces of the hands.

This is one of the few steps that reduces risk across many pathogens, not just one.

Medications to pack: what may help, what to avoid

This section is where the video takes a strong, nuanced stance: do not take antibiotics “just in case” while you are still well, but consider a smart backup plan.

Vaccines: helpful, but not a shield for everything

The discussion notes there are vaccines available for certain causes of diarrheal illness, and they can be “good,” but they do not prevent all traveler’s diarrhea because many different pathogens can cause it.

That is consistent with CDC guidance that vaccines may be recommended based on destination and risk, but they do not replace food and water precautions. The CDC Yellow BookTrusted Source reviews prevention options, including vaccines relevant to travel.

Antibiotics: avoid prophylaxis, consider standby treatment in special situations

The expert is clear that prophylactic antibiotics (taking antibiotics while you are still feeling well) are not recommended.

Two reasons are emphasized:

Personal downside: antibiotics can disrupt your gut microbiome and can cause diarrhea on their own.

Global downside: unnecessary use contributes to antibiotic resistance.

At the same time, the video supports a practical compromise for certain travelers: it can be reasonable to ask your clinician for a prescription to carry, particularly if you will be in a remote area without easy access to care.

Medications mentioned include azithromycin and ciprofloxacin, with the speaker noting they would generally prescribe azithromycin.

This is not a DIY green light. Dosing, drug interactions, pregnancy considerations, and local resistance patterns matter, so it is a plan to make with your clinician.

What the research shows: The CDC Yellow BookTrusted Source generally discourages routine antibiotic prophylaxis for most travelers because risks often outweigh benefits, but it outlines situations where self-treatment may be appropriate.

Bismuth subsalicylate (Pepto-Bismol): the video’s real-world prevention anecdote

A memorable part of the video is a personal story: taking Pepto-Bismol twice a day prophylactically while traveling in Haiti, and not getting sick when a large portion of the group did.

The expert acknowledges there is evidence of some preventive effect, but it is not universally recommended for all travelers. The conversation also names the tradeoffs plainly:

Black tongue can happen.

Black tarry stools can happen, which is alarming if you are not expecting it.

Those effects are known with bismuth products and are usually harmless, but black stools can also be a sign of gastrointestinal bleeding, so context matters. If someone has black stools without having taken bismuth, that is a reason to seek medical evaluation.

The CDC Yellow BookTrusted Source notes that bismuth subsalicylate can reduce the incidence of traveler’s diarrhea in some travelers, but side effects and contraindications limit routine use.

Anti-diarrheals: symptom relief vs letting your body “flush it out”

A common worry is whether stopping diarrhea is “bad,” because diarrhea might be the body’s way of clearing infection.

The video’s stance is balanced: medications like loperamide (Imodium) or bismuth can be helpful to manage symptoms and reduce fluid loss, though they might sometimes delay resolution.

If you are considering these medications, it is especially important to be cautious if you have fever or blood in the stool, and to follow label directions and clinician guidance.

Parasites like giardia: less common, but a different pattern

The video treats parasites as possible but less common for short trips.

For travelers away for a week or two, diarrhea is more likely to be from bacteria or viruses than parasites. The parasite example discussed is giardia, sometimes nicknamed “beaver fever,” and it can be acquired in North America as well as abroad.

The key distinguishing feature emphasized is duration.

Giardia can cause diarrhea that is persistent, lasting weeks or even months, rather than the typical 2 to 3 day course described for common traveler’s diarrhea. That longer timeline is a clue that it is time to get evaluated, especially if symptoms are not improving.

Transmission is still linked to fecal contamination, often through contaminated water or food.

A simple “pattern check” you can use mid-trip

If you are trying to decide whether your illness fits the common pattern discussed in the video, use this quick checklist.

Timing: Did it start within days of exposure to local food or water, and does it look like it could resolve in a few days?

Severity: Are you able to drink fluids and stay alert, or are you becoming weak, dizzy, or faint?

Duration: Are you improving by day 3, or still stuck (or worsening) by day 7?

If the pattern does not fit, especially with blood, high fever, severe dehydration, or prolonged symptoms, getting medical input is the safer move.

Key Takeaways

Traveler’s diarrhea is usually an infectious gut illness, commonly bacterial (often E. coli), and toxins can drive watery stool by pulling fluid into the intestines.

Most cases improve within 2 to 3 days, but dehydration and electrolyte loss are the main dangers, especially for children, older adults, and immunocompromised travelers.

Prevention is risk reduction, prioritize safe drinks, beware ice cubes, be cautious with raw produce washed in tap water, and avoid undercooked meat.

Do not use prophylactic antibiotics in most cases, but a clinician-approved standby plan (often azithromycin) may be reasonable for remote travel.