Nepal Travel Health 2026: Vaccinations, Altitude Sickness & Staying Well on Trek

Key takeaways

See a travel clinic 6–8 weeks before departure; recommended vaccines include Hepatitis A and B, Typhoid and Tetanus (no mandatory jabs to enter Nepal).
Altitude sickness is the primary risk above 3,000m — ascend no more than 500m net per day, hydrate, and never climb higher with symptoms.
Diamox 125mg twice daily, started 24 hours before ascent, cuts AMS risk by ~75%; descent is the only guaranteed cure.
Travel insurance with helicopter evacuation cover is essential — high-altitude evac costs $3,000–10,000 without it.

Staying Healthy in Nepal: What You Need to Know

Nepal is an extraordinarily safe trekking destination by global adventure standards. The Himalayan Rescue Association maintains clinics along major trekking routes; Kathmandu and Pokhara have modern private hospitals; and your guide is trained in first aid and altitude illness recognition. With proper preparation, serious health problems on a Nepal trek are uncommon. This guide covers everything from pre-departure vaccinations to on-trail first aid, drinking water, and what to pack in your medical kit.

Recommended Vaccinations for Nepal

Consult your GP or travel medicine clinic 6–8 weeks before departure for current recommendations. Standard vaccines advised for Nepal:

Hepatitis A and B: Essential. Spread via contaminated water and food (A) and blood/body fluids (B). Most travellers from high-income countries lack Hep A immunity — get vaccinated.
Typhoid: Recommended for all travellers. Oral or injectable; injectable lasts 3 years.
Tetanus: Ensure your booster is current (within 10 years). Trekking trail injuries are a real hazard.
Japanese Encephalitis: Recommended for visits to rural jungle areas (Chitwan, Bardia) during mosquito season (May–October). Terai and lowland travel only — no significant risk above 2,000m.
Rabies pre-exposure (PrEP): Recommended for extended trips (4+ weeks), animal handlers, or travellers visiting rural areas. Stray dogs and monkeys in Nepal can transmit rabies; post-exposure treatment is available in Kathmandu but not always at trail clinics. PrEP dramatically simplifies post-bite treatment.
Meningococcal: Recommended for travellers visiting crowded pilgrimage sites during festival season.
COVID-19: Follow current national guidance from your home country's health authority.

Malaria risk is present in the Terai (southern lowlands, below 1,500m) from June to October but is virtually zero on all major trekking routes above 2,000m. Consult your doctor about anti-malarials if your itinerary includes extended time in the Terai.

Book your travel clinic early

See a GP or travel medicine clinic 6–8 weeks before departure — some vaccine courses (Hepatitis B, rabies PrEP) need multiple doses spread over weeks. There are no mandatory vaccines to enter Nepal, but Hep A, Typhoid and Tetanus are strongly advised.

Altitude Sickness (AMS) — The Primary Health Risk

Acute Mountain Sickness is the most common health concern for trekkers above 3,000m. It is caused by reduced oxygen pressure at altitude — not by physical exertion or fitness level. Anyone can develop AMS regardless of age or fitness. Symptoms: persistent headache, nausea, dizziness, poor sleep, loss of appetite, fatigue. Approximately 50% of trekkers experience mild AMS above 3,500m; most resolve with a rest day.

Prevention

Ascend slowly: do not gain more than 500m net altitude per day above 3,000m
Drink 3–4 litres of water per day — dehydration worsens AMS symptoms
Avoid alcohol for the first 2–3 days at altitude
Take mandatory acclimatisation rest days (Namche on EBC, Manang on Annapurna Circuit, Dingboche before base camps)
Sleep at lower altitude than the highest point you reach each day where possible

Treatment

Acetazolamide (Diamox) 125mg twice daily: Starting 24 hours before ascent reduces AMS risk by approximately 75%. Requires prescription. Discuss with your doctor before travel. Common side effects: increased urination, tingling in fingers and toes, altered taste of carbonated drinks.
Ibuprofen 400mg three times daily: Clinical evidence supports its effectiveness in reducing AMS headache at altitude.
Descent: The only guaranteed cure. Even 300–500m of descent typically resolves symptoms within hours. Never ascend while symptomatic — AMS can rapidly progress to HACE or HAPE.

Never ascend with symptoms

If you have any AMS symptoms — headache, nausea, dizziness, poor sleep — do not climb higher. Rest at the same altitude or descend. Untreated AMS can progress to life-threatening HACE or HAPE; descent is the only guaranteed cure.

For a thorough deep dive, see our dedicated altitude sickness prevention and treatment guide.

HACE and HAPE — Serious Altitude Illness

High Altitude Cerebral Edema (HACE) and High Altitude Pulmonary Edema (HAPE) are life-threatening conditions requiring immediate descent and emergency evacuation. Signs of HACE: severe headache unresponsive to ibuprofen, loss of coordination, confusion, altered mental state. Signs of HAPE: breathlessness at rest, persistent cough (sometimes producing pink frothy sputum), blue lips. Both are medical emergencies. Your guide carries a pulse oximeter and is trained to recognise these conditions. Never ascend with any AMS symptoms.

Water and Food Safety

Traveller's diarrhoea affects roughly 30–40% of Nepal trekkers. Main causes: contaminated water, undercooked food, and inadequate handwashing.

Water: Never drink tap water or unverified stream water, even on trail. Options in descending preference: boil for 1 minute (standard at most teahouses), chemical purification (iodine tablets or chlorine dioxide tablets), UV pen (SteriPen — effective but requires clear water), commercial bottled water (creates significant plastic waste — we discourage this). On most major trails, teahouses sell purified or boiled water for NPR 80–200 per litre.
Food: Freshly cooked dal bhat is the safest meal on trail — it is cooked to order and served hot. Avoid raw salads, raw vegetables, and pre-cut fruit at basic teahouses below 2,000m (higher risk of contamination). In Kathmandu, tourist-oriented restaurants with high turnover are generally safe; street food is moderate risk.
Hands: Use alcohol hand sanitiser (at least 60% alcohol) before all meals on trek, especially at teahouses with no running water.

Treatment: oral rehydration salts (ORS) + loperamide for symptom control. If fever develops or symptoms persist beyond 48 hours, seek medical attention — bacterial infection (Giardia, Campylobacter) requires antibiotics.

Sun and UV Protection at Altitude

UV radiation increases approximately 10% for every 1,000m of altitude gain. At 5,000m (EBC), UV intensity is roughly 50% higher than at sea level. Consequences: severe sunburn in 20–30 minutes without protection, snow blindness from UV reflection off glaciers, and increased long-term skin cancer risk.

SPF 50+ sunscreen — reapply every 2 hours when hiking, especially on glacier sections
UV-blocking sunglasses with side shields (wrap-around style) — standard sunglasses do not adequately protect from reflected glacier UV
UPF 50+ sun hat with neck coverage
Lip balm with SPF 30+ (lips burn at altitude faster than facial skin)

Medical Facilities on the Trail

Major trekking corridors have basic medical support available:

Namche Bazaar (3,440m)

HRA clinic plus private pharmacies well stocked with altitude medication.

Pheriche (4,240m)

HRA clinic staffed by volunteer doctors during the spring and autumn seasons.

Manang (3,500m)

HRA clinic on the Annapurna Circuit; mandatory altitude lecture before Thorong La.

Kathmandu

CIWEC and Nepal International Clinic — gold-standard pre-trek advice and post-trek treatment.

Namche Bazaar (3,440m): Himalayan Rescue Association clinic, private pharmacies with a good stock of altitude medication
Pheriche (4,240m): HRA clinic staffed by volunteer doctors during spring and autumn seasons
Manang (3,500m): HRA clinic on the Annapurna Circuit — mandatory altitude lecture for trekkers continuing to Thorong La
Kathmandu: CIWEC Hospital Travel Medicine Centre and Nepal International Clinic are the gold-standard facilities for pre-trek health advice and post-trek illness treatment

Below 3,500m on major trails, expect a health post in most large villages. Above 4,000m, the HRA clinics are your primary resource outside helicopter evacuation.

Recommended First Aid Kit for Nepal

Your guide carries a group first aid kit, but every trekker should carry personal basics:

Paracetamol and ibuprofen (pain, fever, AMS headache)
Oral rehydration salts (4–6 sachets)
Loperamide (Imodium) — diarrhoea control
Antihistamine (allergy, sleep at altitude)
Blister kit: moleskin, Compeed, surgical spirit
Antiseptic wipes and wound closure strips
Ace bandage / elastic support bandage (ankle sprains)
Pulse oximeter (optional but strongly recommended for EBC/Annapurna Circuit — ~$25 on Amazon)
Altitude medication if prescribed (Diamox, Dexamethasone for HACE)
Any personal prescription medications × 2 (one in hand luggage, one in pack)

Travel Insurance for Nepal

All trekkers in Nepal should carry insurance with helicopter evacuation cover. Evacuation from high altitude costs USD $3,000–10,000 without insurance. Verify your policy explicitly covers: altitude above 5,000m, helicopter evacuation, and mountain rescue operations. WorldNomads, True Traveller, IATI, and Campbell Irvine are popular options among Himalayan trekkers. Purchase before departure — Kathmandu policies are cheaper but frequently exclude high-altitude helicopter evacuation. See our Nepal trekking insurance guide for recommended providers and a comparison of what policies actually cover.

Check the altitude clause

Verify your policy explicitly covers altitude above 5,000m, helicopter evacuation and mountain rescue. Buy before departure — Kathmandu-bought policies are cheaper but frequently exclude high-altitude helicopter evacuation, the one thing you most need.

Frequently Asked Questions

Do I need any vaccinations to enter Nepal?

Nepal has no mandatory vaccination requirements for entry from most countries. Yellow fever vaccination certificate is required only if you are travelling from a yellow-fever endemic country. However, the recommended vaccinations above are strongly advised for your own protection — particularly Hepatitis A, Typhoid, and Tetanus.

Can I buy Diamox in Nepal without a prescription?

Yes — acetazolamide is available over the counter at pharmacies in Kathmandu's Thamel district and at Namche Bazaar. However, we strongly recommend discussing it with your doctor before travel. Diamox can mask AMS symptoms without preventing the underlying condition progressing; it also has contraindications with certain medications and a sulfa drug allergy. Carry enough for your entire trek rather than relying on trail pharmacies.

Is tap water safe to drink anywhere in Nepal?

No — tap water in Nepal is not safe to drink anywhere, including Kathmandu and Pokhara. Municipal water is untreated or inadequately treated. Always purify or boil water, or buy commercial bottles. On trek, most teahouses provide boiled water for a small fee; many now have water purification stations (Sawyer or UV filters) where you can fill your bottle for NPR 50–100.

What should I do if I feel sick in a remote area on trek?

Tell your guide immediately — this is critical. Most symptoms (headache, nausea, upset stomach) are manageable on trail. For AMS symptoms above 3,500m, the guide will monitor your SpO₂ with a pulse oximeter and may initiate descent. For any suspected HACE or HAPE, descent begins immediately regardless of time of day or weather. Helicopter evacuation is arranged by the guide via the agency; payment is made by your insurance company directly in most cases. Make sure your guide has your insurance policy number and emergency hotline before departure.

What is the most common health problem on a Nepal trek?

Altitude sickness (AMS) above 3,000m and traveller's diarrhoea. AMS affects around 50% of trekkers above 3,500m in mild form; ascend slowly, hydrate, and never climb higher with symptoms. For stomach upsets, drink only purified or boiled water and stick to freshly cooked hot food like dal bhat.

Do I need travel insurance to trek in Nepal?

Yes — it is essential and most operators require proof. A high-altitude helicopter evacuation costs $3,000–10,000 out of pocket. Make sure your policy explicitly covers altitude above 5,000m, helicopter evacuation and mountain rescue, and buy it before you leave home.

Plan the rest of your trip with our Nepal trekking packing list and budget it using the Nepal trekking cost guide.

Trek Safely We take your health on trail seriously

Every Travel Himalaya Nepal guide carries a pulse oximeter, group first aid kit, and emergency oxygen for high-altitude treks. Our EBC and Annapurna guides monitor SpO₂ readings daily above 4,000m. Zero fatalities in 5,000+ guided treks — safety is not a marketing claim here, it is our record.

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This guide is for general information only. Consult a travel medicine physician before departure.