This article isn't a medical textbook, but a guide to the main risks. If you're planning a trek in mountains outside your home country, be sure to consult a doctor several weeks before departure. A doctor can advise which vaccinations are relevant and what medications you should carry based on your individual needs.
And here's the golden rule: if you notice someone in your group developing alarming symptoms (severe weakness, fever, rash, or stomach issues), don't try to treat them in a tent. The best solution is immediate evacuation to the nearest town or village with a doctor. In the mountains, time is not on your side.
Diarrhea
• Risk areas: Everywhere, including remote mountain villages and campsites.
• What it is: The familiar "loose stools" (3+ times a day).
• How you get it: Unwashed hands, contaminated water from streams or rivers, improperly handled food.
• Prevention in the mountains: Always wash your hands or use hand sanitizer. Always boil or purify water from mountain sources with purification tablets—even the clearest-looking glacial stream water. Keep Imodium and smectite in your pack for emergencies.
Cholera
• Risk areas: Asia, Africa, and parts of Eastern Europe.
• What it is: A severe intestinal infection.
• How you get it: Through contaminated water or food.
• Prevention: Strict food safety. When trekking in remote regions, avoid buying food from street vendors if you're unsure of its freshness. Drink only boiled or bottled water. A vaccine exists, but it's only about 50% effective.
Hepatitis A
• Risk areas: Developing countries in Africa, Asia, and Latin America.
• What it is: A viral liver infection.
• How you get it: Same story—water, unwashed fruits and vegetables, dirty hands.
• Symptoms: Fever, nausea, weakness, yellowing of the skin and eyes (jaundice).
• Prevention: The best protection is vaccination (done before your trip). On the trail, thoroughly wash fruits and vegetables with boiled water if you bought them at a local market.
Hepatitis B
• Risk areas: Africa, India, Central Asia, Southeast Asia.
• What it is: A more severe liver infection.
• How you get it: Through blood and bodily fluids. In trekking conditions, risk arises from unsterile injections (e.g., in a rural clinic) or contact of open wounds with someone else's blood.
• Prevention: Vaccination. Always carry sterile syringes in your personal first aid kit and only treat your wounds with your own supplies.
Japanese Encephalitis
• Risk areas: Agricultural areas of Southeast Asia and the Far East.
• What it is: A virus affecting the central nervous system.
• How you get it: Mosquito bites (especially in rural areas near rice paddies).
• Prevention: Vaccination. Standard precautions apply—wear protective clothing, use repellent, and use a mosquito net in your tent.
Malaria
• Risk areas: In high mountains (above 2000-2500 m), malaria-carrying mosquitoes are virtually absent. But risk exists in the foothills and valleys of Africa, Asia (including Central Asia), and South America.
• What it is: A parasitic disease.
• How you get it: Bites from Anopheles mosquitoes (active at dusk and night).
• Prevention: Antimalarial tablets, which must be started before entering the risk zone. The choice of medication depends on the region. Always use repellent and sleep under a mosquito net.
Meningococcal Meningitis
• Risk areas: Highest risk in parts of Africa (the "meningitis belt"), but outbreaks can occur elsewhere.
• What it is: Inflammation of the brain lining or blood infection (sepsis).
• How you get it: Airborne droplets (close contact in transport, yurts, guesthouses).
• Symptoms: Fever, severe headache, vomiting, inability to touch chin to chest ("stiff neck"), purplish rash.
• Prevention: Vaccination. If suspected—immediate evacuation is critical.
Tetanus
• Risk areas: Everywhere. Risk is higher in the mountains because injuries are common: cuts from rocks, stepping on a rusty nail, wounds from ice axes or camp stoves.
• What it is: A nervous system disease, also known as "lockjaw."
• How you get it: Dirt or soil entering a deep wound. Soil in grazing areas is particularly dangerous.
• Prevention: Vaccination! If your last shot was over 10 years ago, you need a booster before your trek. On the trail, thoroughly clean and disinfect any deep wounds.
Typhoid Fever
• Risk areas: Poorer regions of Asia, Africa, and Central/South America.
• What it is: A severe intestinal infection.
• How you get it: Through contaminated water and food.
• Symptoms: Prolonged fever, headache, abdominal pain.
• Prevention: Vaccination. On your trek, avoid street food, salads washed in local water, and ice in drinks (ice is often made from untreated water).
Yellow Fever
• Risk areas: Africa and tropical South America. Vaccination is mandatory for entry into some countries in these regions (you may be denied entry without a certificate).
• Prevention: Vaccination.
Summary for Mountain Trekkers
When heading into the mountains, likely far from civilization, remember: your main enemies are not exotic viruses, but:
1. Water, sanitation, and hygiene (always boil or purify water!).
2. Injuries and tetanus (check your vaccination status).
3. Hypothermia, altitude, and lack of acclimatization (altitude sickness is the most common problem in the mountains).
From the list above, essential vaccinations are for tetanus and hepatitis A. Vaccinations for hepatitis B, typhoid, and meningitis are optional, but doctors often recommend them, especially for extended travel in Asia or Africa.
Always carry a well-stocked first aid kit. Beyond bandages and plasters, it should include rehydration salts, antiseptics, and broad-spectrum antibiotics (prescribed by your doctor). Take care of yourself and happy trails!
Previous guide: First Aid on a Hike: Burns, Overheating, and Hypothermia You can view the full list here: Survival Guides for the Mountains
