Health in Mexico

The short version

Most health problems on a Mexico trip are minor and predictable: an upset stomach, sunburn, a hangover made worse by heat or altitude, mosquito bites. A few habits handle almost all of it. Drink bottled or purified water, eat food that is cooked and served hot, wear repellent in the lowlands and sunscreen everywhere, and take it easy for the first day or two in Mexico City.

The serious risks are less common but expensive: a fall, a car crash or a heart attack far from home, a bad outcome from cheap surgery, or a near-drowning. Mexico's best private hospitals are very good, but they want payment up front, most will not bill your US insurer, and Medicare does not pay. The single most important health purchase for a Mexico trip is travel medical insurance with evacuation coverage.

This page follows CDC travel guidance for water, food, vaccines, mosquitoes and altitude, and uses 2026 figures from the Pan American Health Organization (PAHO) for dengue and measles. For crime, police and natural hazards, see Safety.

Water and ice: what is safe

Do not drink tap water anywhere in Mexico, including Mexico City and the big resorts. City water is usually treated at the plant, but it travels through old pipes and sits in rooftop tanks (tinacos) before it reaches the faucet. Mexicans themselves drink bottled or purified water, so you are following local practice. CDC advises drinking only sealed bottled water or water that has been boiled, properly filtered or chemically disinfected.

What is generally fine

• Sealed bottled water, sold everywhere. Check that the cap seal is intact.
• Purified water from hotel dispensers and from the 5-gallon (20-liter) jugs called garrafones that every home, office and rental uses. Brands such as Bonafont and Epura deliver; neighborhood purificadoras refill them cheaply.
• Hot coffee and tea, made with boiled water.
• Sealed bottled and canned drinks: soda, beer, mineral water. Wipe the rim or use a straw.

Ice

CDC's advice is to avoid ice unless it was made from safe water. In practice, restaurants, bars and hotels in tourist areas and cities almost always buy commercial purified ice (hielo purificado), delivered in bags. The hollow cylinder or tube-shaped cubes are the giveaway that it came from a factory. Ice of uncertain origin (shaved ice at a roadside stand, irregular chunks in a tiny rural place) is the one to skip. If you want to be sure, ask "¿El hielo es purificado?" Nobody will be offended.

Brushing teeth, showers and aguas frescas

Use bottled or purified water to brush your teeth; most hotels leave a bottle by the sink for this reason. Showering is fine, just keep your mouth closed. Fruit waters (aguas frescas) at restaurants are normally made with purified water; at street stands, it depends on the vendor, so choose busy stands with a big garrafón in sight. More on drinks, including cocktails and the ice question in bars, on Drinks.

Food and traveler's diarrhea

Traveler's diarrhea is the most common illness on any trip to Mexico. CDC's figures show attack rates of roughly 30 to 70 percent over a two-week trip to higher-risk destinations, depending on season and itinerary. Bacteria cause most cases, led by a strain of E. coli, and they come from food and drink handled with dirty hands or contaminated water.

How to lower the odds

• Eat it hot. Food cooked to order and served steaming is the safest choice, whether at a taco stand or a fine restaurant.
• Pick busy stands. High turnover means fresh ingredients. Look for vendors who handle money and food with different hands or use gloves.
• Be choosy with raw produce. Fruit you peel yourself is fine. Salads, cut fruit and raw garnishes (cilantro, onion, lettuce, salsas left out all day) carry more risk at street level; good restaurants disinfect produce with drops such as Microdyn, which you can buy for your own kitchen.
• Treat raw seafood with respect. Ceviche and aguachile are "cooked" only by lime juice. Eat them at places with a fast seafood trade, and skip raw oysters if you have liver disease or a weak immune system.
• Avoid unpasteurized dairy, including some fresh cheeses and street-made ice cream.
• Wash or sanitize your hands before eating. Bring a small bottle of sanitizer.

Food in Mexico is one of the great reasons to go, and avoiding street food entirely would mean missing the best of it. The Food page has more on ordering and eating safely.

Prevention with bismuth (Pepto-Bismol)

Bismuth subsalicylate, the ingredient in Pepto-Bismol, cut traveler's diarrhea by about half in studies done in Mexico, according to CDC. It turns your tongue and stool black, which is harmless. It is not for children under 12, pregnant women, people allergic to aspirin, or people on blood thinners and certain other drugs, so check with your doctor. CDC does not recommend taking antibiotics to prevent diarrhea for most travelers.

If you get sick

1. Rehydrate first. Oral rehydration solution is the core treatment. Every pharmacy and convenience store sells it: look for suero oral packets or the Electrolit drinks Mexicans swear by.
2. For mild cases, loperamide (Imodium) can calm things down. CDC's adult dose is 4 mg first, then 2 mg after each loose stool, up to 16 mg a day. Do not use it alone if you have a fever or blood in the stool.
3. For moderate or severe cases (you cannot do what you planned, or you have fever or bloody diarrhea), an antibiotic helps. CDC lists azithromycin as a preferred option, often as a single 1,000 mg dose. Ask your US doctor for a standby prescription before you leave; in Mexico, antibiotics require a prescription, which a pharmacy-side doctor can write.
4. See a doctor for high fever, blood in the stool, signs of dehydration (very little urine, dizziness), or symptoms lasting more than a few days. Children and older adults dehydrate fastest.

CDC vaccines and medicines for Mexico

See your doctor or a travel clinic four to six weeks before the trip if you can. CDC's recommendations for Mexico come down to this:

Measles in 2026

Mexico has had a large measles outbreak, and CDC's global measles notice includes Mexico. PAHO counted 13,691 confirmed cases and 23 deaths in Mexico in 2026 through mid-October. Jalisco (Guadalajara and Puerto Vallarta) accounted for more than half, with Mexico City and Chiapas next. PAHO's October 2026 report shows transmission declining. CDC advises that everyone 6 months and older be fully protected before international travel: babies 6 to 11 months should get an early dose, and older children and adults without proof of immunity need two doses at least 28 days apart. If you are not sure, a blood test or a booster is easy to get.

Other current CDC notices

CDC has a Level 1 notice (December 2025) for Rocky Mountain spotted fever in Mexico, a tick-borne infection that is especially common in the north, where brown dog ticks spread it in neighborhoods with many stray dogs. It is rare among tourists but can be fatal if treatment is delayed. If you get a fever, headache or rash within two weeks after contact with dogs or ticks, see a doctor and mention it; the antibiotic doxycycline works best when started early.

Mosquito-borne illness: dengue, Zika, chikungunya

Dengue

Dengue is the mosquito illness that matters most in Mexico. CDC puts parts or all of the country in its highest risk category, with frequent or continuous transmission. The mosquito that spreads it, Aedes aegypti, bites during the day, especially early morning and late afternoon, and breeds in standing water around houses. Risk is highest on both coasts and in the Yucatán during the rainy months, roughly June to November, and low at high altitude in places like Mexico City.

2024 was a record year for dengue in Mexico. 2026 has been calmer: PAHO reported 52,866 probable cases and 5,859 laboratory-confirmed cases, with 26 deaths, through mid-September, with all four virus types circulating and type 3 dominant. Cases started rising in mid-June as the rains arrived, which is the normal pattern.

About half or more of infections cause no symptoms. When they do, expect a sudden high fever, a severe headache, pain behind the eyes, aching joints and muscles and sometimes a rash, usually 5 to 7 days after the bite. A small share of patients develop severe dengue, and the warning signs (severe belly pain, persistent vomiting, bleeding gums or nose, extreme tiredness) tend to appear just as the fever goes down. Get to a doctor right away if they appear.

Zika

Mexico is on CDC's list of places with current or past Zika transmission, but there is no active CDC Zika travel notice for Mexico as of October 2026. The concern is pregnancy, because Zika can cause severe birth defects. If you are pregnant or planning to conceive, talk to your doctor before the trip, prevent bites strictly, and ask about CDC's guidance on waiting after travel before trying to conceive.

Chikungunya

PAHO reports chikungunya rising across the Americas in late 2025 and 2026, but CDC has no chikungunya notice for Mexico. A vaccine exists; CDC recommends it mainly for travel to places with an active outbreak.

How to avoid bites

• Use an EPA-registered repellent with DEET, picaridin, IR3535 or oil of lemon eucalyptus. Put sunscreen on first, then repellent.
• Wear long sleeves and pants at dawn and dusk, and consider permethrin-treated clothing for jungle trips.
• Choose rooms with air conditioning or intact window screens, and use the mosquito net if one is provided.
• Keep using repellent for three weeks after you get home if you are back in a US area with Aedes mosquitoes, so you do not spread an infection you picked up.

Altitude in Mexico City and the highlands

Many Americans do not realize how high central Mexico is. Mexico City sits at about 7,350 ft (2,240 m), higher than Denver. CDC says altitude illness becomes a risk for people sleeping at about 8,000 ft (2,450 m) or higher and sometimes lower, so the capital is right at the edge. Most visitors feel only short breath on stairs, a mild headache, poor sleep and a faster buzz from alcohol for the first day or two.

CDC's advice: go easy on exercise and skip alcohol for the first 48 hours, drink water, and do not judge your risk by fitness, which does not protect you. Symptoms of acute mountain sickness (headache plus nausea, dizziness, fatigue or loss of appetite) usually start 2 to 12 hours after arrival and fade within a day or two. If they get worse instead, descend and see a doctor. People with heart or lung conditions, and anyone planning a volcano climb such as Iztaccíhuatl, Pico de Orizaba or the Nevado de Toluca, should talk to a doctor first; acetazolamide is an option for fast ascents.

Mexico City's air is also an issue in the dry, sunny months from about February to May, when ozone builds and the city declares environmental contingencies (contingencias ambientales). On those days, people with asthma should limit outdoor exercise.

Sun and heat

Mexico is much closer to the equator than most of the US. The midday sun is intense year round, at the beach and in the highlands, where thin air lets more UV through. Sunburn is the most common avoidable injury on a Mexico vacation.

• Use broad-spectrum SPF 30 or higher and reapply after swimming. Wear a hat and sunglasses and seek shade from about 11 a.m. to 3 p.m.
• Swim in a rash guard. It saves sunscreen and your back on snorkel trips.
• Mind the sunscreen rules. Many cenotes ban sunscreen entirely, and eco-parks on the Riviera Maya require biodegradable, mineral-based sunscreen. Bring one that qualifies, or buy it at the park.
• Respect the heat. Mérida and the interior of the Yucatán routinely pass 95°F (35°C) from April to June, and the Sonoran and Baja deserts hit 105°F (40°C) or more in summer. Plan ruins and walks for early morning, drink before you are thirsty and add electrolytes.
• Know heat exhaustion: heavy sweating, weakness, nausea, headache. Get into shade or air conditioning and cool down. Confusion or stopping sweating signals heat stroke, which needs 911.

Scorpions, jellyfish, sea lice and other creatures

Scorpions

Mexico records a very large number of scorpion stings, and the dangerous species (Centruroides) live mainly in the central and Pacific states, including Jalisco, Nayarit, Colima, Michoacán, Guerrero, Morelos, Guanajuato and Durango. Most stings in adults are painful but not dangerous. Signs of a serious sting are numbness spreading beyond the sting, trouble swallowing, drooling, restlessness, unusual eye movements or difficulty breathing, especially in children. Antivenom is widely available in Mexican hospitals and clinics; go straight there. Shake out shoes and clothes, check bedding in rustic places, and do not walk barefoot at night.

Jellyfish and sea lice

On the Caribbean coast (Cancún, Cozumel, Playa del Carmen), "sea lice" are the tiny larvae of thimble jellyfish. They get trapped under swimsuits and leave an itchy, red rash a few hours later, mostly in spring and early summer. Shower soon after swimming, take off the swimsuit before rinsing, and use hydrocortisone cream and an antihistamine. Portuguese man o' war and other jellyfish wash in on both coasts, especially after storms, and a purple or blue beach flag warns of them. For stings, rinse with seawater instead of fresh water, lift off tentacles with a card or tweezers, and use hot water or a cold pack for pain. Severe pain, breathing trouble or a sting over a large area needs a doctor. The Beaches page covers flags and the best swimming beaches by coast.

Stingrays, crocodiles and dogs

• Stingrays rest in shallow sand on Pacific and Gulf of California beaches. Shuffle your feet as you wade. A sting is very painful; soak it in water as hot as you can tolerate and get it checked for barb fragments.
• Crocodiles live in lagoons and estuaries around Puerto Vallarta, Ixtapa, Cancún's lagoon side and the Yucatán. Obey the signs and do not swim in lagoons.
• Dogs and bats: Mexico was the first country certified free of dog-transmitted human rabies, but bats and some wild animals still carry it. Wash any animal bite or scratch with soap and water for 15 minutes and see a doctor the same day.

Pharmacies

Mexican pharmacies are everywhere, and big chains such as Farmacias Guadalajara, Farmacias del Ahorro, Farmacias Benavides and San Pablo keep long hours, with 24-hour branches in cities. Pharmacists are helpful for minor problems, and the chains stock most medicines Americans use, usually much cheaper than at home.

What you can buy over the counter

• Pain relievers, antacids, rehydration salts, loperamide, antihistamines, hydrocortisone cream and the usual cold remedies (though not pseudoephedrine; see below).
• Some drugs that need a prescription in the US, such as birth control pills and many common maintenance medicines, are sold without one.
• Antibiotics require a prescription in Mexico, and pharmacies keep a record of it. A doctor at a pharmacy-side clinic can examine you and write one.
• Controlled drugs (opioid painkillers, benzodiazepines such as Xanax, ADHD stimulants) require special prescriptions. A legitimate pharmacy will not sell them over the counter.

Farmacias Similares and pharmacy-side doctors

Many pharmacies have a small doctor's office next door or inside, called a consultorio. The best known is Farmacias Similares, with its cartoon mascot Dr. Simi dancing on the sidewalk. Its consultorios see walk-ins for a token fee, usually well under MX$100 (about $5), and are a reasonable choice for an ear infection, a sore throat, a urinary tract infection or a bad stomach. Expect a basic exam, a prescription for generic drugs and little English outside tourist areas. For anything serious, go to a private hospital instead.

Bringing your own medicines into Mexico

Bring prescription medicines in their original labeled containers with a copy of the prescription, and enough for the whole trip plus a few extra days. The State Department warns that some medicines sold over the counter in the US are controlled in Mexico; it names pseudoephedrine (Sudafed and many "D" allergy pills), and says travelers could be arrested even with a doctor's letter. If you take a controlled medicine such as an ADHD stimulant, a strong painkiller or a benzodiazepine, carry a doctor's letter, bring only what you need and check with a Mexican consulate before you go.

Bringing medicines home

Buying a stock of medicine in Mexico to take home is common along the border, but the rules are narrower than many people think. The FDA says most drugs bought abroad cannot legally be imported, with a limited personal-use exception generally capped at a three-month supply. Controlled substances fall under DEA rules and need a valid US prescription. Declare all medicines to CBP. Details are on the Shopping and bringing things home page.

Hospitals: quality and costs

Mexico has two systems. The public system (IMSS, ISSSTE and state hospitals) serves Mexicans with coverage, and while it treats emergencies, it is crowded and not set up for visitors. Tourists use private hospitals, and in Mexico City, Guadalajara, Monterrey, Mérida and the major resort areas these can be excellent, with modern equipment and many US-trained specialists. Well-known names include ABC (American British Cowdray) and Médica Sur in Mexico City, the Ángeles and Star Médica chains in many cities, and Hospiten and Galenia in Cancún and the Riviera Maya. In small towns and rural areas, care is basic and you may need a transfer.

How paying works

• Payment up front. The State Department notes that private hospitals often require payment before treatment and that most do not accept US health insurance. Expect to leave a credit card guarantee or deposit on admission.
• Prices. A pharmacy-side consultation costs a few dollars, and a private specialist visit or a night in hospital costs less than in the US but is far from free. Some resort-area hospitals market themselves to insured tourists, and Americans regularly report startling bills there. Ask for written estimates.
• Call your insurer immediately. A travel insurer's assistance line can guarantee payment directly to the hospital, check that charges are reasonable and arrange a transfer. Do this before you sign anything if you can.
• Get everything in writing: itemized bills, receipts, a medical report in English. You will need them for any claim.

Carbon monoxide

The State Department reports that Americans have died of carbon monoxide poisoning in Mexico, often from gas water heaters in rentals and small hotels without detectors. A small portable CO detector costs little and weighs almost nothing; pack one.

Travel medical insurance and evacuation

Private US health plans vary. Some treat a foreign emergency as out of network and reimburse you later; many exclude evacuation. Read the policy or call before you go.

Why evacuation coverage matters

If you are badly hurt in Tulum or have a stroke in San Miguel, the issue is often getting from a small hospital to a big one, or home. An air ambulance from Mexico to the US commonly costs tens of thousands of dollars, payable before takeoff. The State Department specifically recommends travel insurance that includes medical evacuation for Mexico.

What to look for

• Emergency medical coverage with a high limit. A common rule of thumb is at least $100,000 for medical care and $250,000 for evacuation, more for older travelers.
• Primary coverage, so the insurer pays first instead of waiting for your US plan to deny the claim.
• A 24-hour assistance line that can guarantee payment to a Mexican hospital.
• Pre-existing condition coverage, usually available if you buy soon after your first trip payment.
• Activities covered: scuba diving, ziplining, surfing and riding scooters or ATVs are often excluded.
• Evacuation terms: many policies move you only to the "nearest adequate facility." Medical transport memberships, a separate product, can fly you to a hospital of your choice at home.

Living in Mexico long term is a different question (Mexican private insurance, IMSS voluntary enrollment). See Long stays and retiring.

Medical and dental tourism, honestly assessed

Hundreds of thousands of Americans cross into Mexico every year for dental work, surgery, prescriptions and eye care, and most come home satisfied with lower bills. Dental care is the most common type, according to CDC. But the risks are real, and they are concentrated in the cheapest, most heavily marketed procedures.

What the US government says

The State Department says many Americans have suffered serious complications or died after cosmetic or elective surgery in Mexico, and that options for malpractice claims are very limited. CDC lists infections as the most common complication of medical tourism and has documented outbreaks linked to Mexico, including fungal meningitis in patients who received epidural anesthesia there (an outbreak tied to clinics in Matamoros in 2023 killed several patients) and drug-resistant bacterial infections after invasive procedures. In March 2023, four Americans who traveled to Matamoros for a cosmetic procedure were kidnapped and two were killed; Tamaulipas is Level 4.

The main hubs

How to do it more safely

1. Check credentials. Every Mexican doctor and dentist has a professional license number (cédula profesional), searchable in the SEP's national registry; specialists should also show a specialty board certification. Ask for both and verify them.
2. Check where the procedure happens. Surgery should be in a licensed hospital with an intensive care unit, not an office or a "surgical suite" in a clinic. Accreditation by Joint Commission International (JCI) or Mexico's Consejo de Salubridad General is a plus, though CDC notes accreditation does not guarantee a good outcome.
3. Get a written plan and quote covering what is included, who does the procedure, anesthesia, follow-up visits and what happens if something goes wrong.
4. Be wary of bundles and bargains. Multiple cosmetic procedures in one session, prices far below other clinics and aggressive social-media recruiters are red flags.
5. Talk to your US doctor first and agree on who will handle follow-up and complications at home. Some US doctors are reluctant to take on complications from surgery abroad.
6. Plan the recovery. CDC suggests avoiding flying for 10 days after chest or abdominal surgery and 7 to 10 days after facial, eyelid or nose procedures. Bring a companion.
7. Take your records home, in English: operative notes, implants used, X-rays and prescriptions.

What to pack

• Prescription medicines in original containers, with copies of prescriptions using generic names, plus a few days' extra.
• A doctor's letter for any controlled medicine. No pseudoephedrine products.
• Insect repellent (DEET, picaridin, IR3535 or oil of lemon eucalyptus).
• Broad-spectrum sunscreen, including a biodegradable mineral one for cenotes and eco-parks, plus a hat and a rash guard.
• Oral rehydration packets, loperamide, bismuth tablets and, if your doctor agrees, a standby antibiotic.
• Acetaminophen for fever (avoid ibuprofen if dengue is possible), antihistamine and hydrocortisone cream.
• Hand sanitizer, adhesive bandages, blister care and a small thermometer.
• A portable carbon monoxide detector for rentals.
• A refillable water bottle, ideally with a filter rated for travel use.
• Your insurance card, the policy's 24-hour assistance number and a list of your conditions and allergies, in English and ideally Spanish.

For the full packing list, see Packing.