Health & Fitness
From 8-week training plans and altitude sickness prevention to vaccinations, water purification, and first aid on the trail — everything you need to arrive strong, stay safe, and return healthy from your Nepal trek.
Health at High Altitude
High-altitude trekking introduces physiological challenges that have nothing to do with fitness and everything to do with how the human body responds to reduced atmospheric pressure and oxygen availability. Above 2,500m, the partial pressure of oxygen drops enough to trigger the hypoxic ventilatory response — your body breathes faster, heart rate increases, and a cascade of hormonal changes begins that takes days to complete. This process, properly managed, is called acclimatization. Rushed or mismanaged, it becomes Acute Mountain Sickness.
The critical insight that eludes many first-time altitude trekkers is that fitness provides no protection from AMS. The fittest marathoner is just as vulnerable to altitude sickness as a sedentary trekker if they ascend too fast — sometimes more so, because fit people often push harder and ascend faster than their body can safely adapt. The Himalayan Rescue Association in Namche Bazaar reports that a significant percentage of their AMS cases are physically very fit individuals who "felt fine" and ignored early symptoms while continuing to ascend.
Fitness does matter enormously for a different reason: it determines how much energy you have left at the end of each 6–8 hour day. A fit trekker finishes the day tired but functional; an unfit trekker arrives at the tea house completely depleted, eats poorly, and starts the next day already behind on recovery. Over a 12-day itinerary, this cumulative deficit becomes significant. This is why training for Nepal specifically means building the aerobic capacity to sustain moderate-intensity exercise for extended periods, not just having a fast 5km race time.
Nutrition at altitude deserves specific attention. Appetite suppression is common above 4,000m — your body needs more calories to fuel extra breathing effort and thermoregulation, but you often want to eat less. Force yourself to eat high-carbohydrate meals (dal bhat is ideal — rice is the perfect altitude food), drink 3–4 litres of water daily, and avoid alcohol for the first week. Our health guides provide medical checklists, vaccination schedules for Nepal, first aid kit recommendations, and detailed guidance on recognizing and responding to altitude emergencies.
Health & Fitness at a Glance
Training Plans
Beginner to advanced
AMS Risk Above
Monitor symptoms above this
Water Per Day
At altitude minimum
Diamox Dose
Twice daily prophylaxis
All Health & Fitness Guides
Training plans, altitude sickness guides, vaccination schedules, water treatment advice, and medical preparation for every trek level.
Frequently Asked Questions
What are the symptoms of Acute Mountain Sickness (AMS) and what should I do?
AMS can affect anyone above 2,500m regardless of age or fitness level — being fit does not protect you from altitude sickness, and going slowly does. Early AMS symptoms include: persistent headache (the most common first sign), loss of appetite, nausea, fatigue disproportionate to exertion, dizziness, and disturbed sleep. Mild AMS is self-limiting if you stop ascending — rest at the same altitude, drink plenty of water, and avoid alcohol. Do not continue ascending with any AMS symptoms. Moderate AMS involves severe headache not relieved by ibuprofen, vomiting, reduced coordination, and worsening weakness. Descend 300–1,000m immediately and seek medical advice. Severe AMS escalating to HAPE (fluid in lungs — persistent cough, breathlessness at rest, gurgling sound when breathing) or HACE (brain swelling — confusion, loss of coordination, extreme fatigue) requires immediate descent and emergency evacuation. These are life-threatening emergencies. Never leave a HAPE or HACE patient alone, and use a Gamow bag if available while arranging helicopter rescue.
Should I take Diamox (acetazolamide) for altitude sickness prevention?
Diamox (acetazolamide) is the most widely used and evidence-backed medication for AMS prevention. It works by acidifying the blood, which stimulates deeper breathing and accelerates acclimatization. The standard prophylactic dose is 125mg twice daily, started 1–2 days before ascending above 2,500m. Some doctors prescribe 250mg twice daily — the higher dose is more effective but increases side effects. Common side effects include increased urination (helpful for hydration monitoring), tingling in fingers and toes (benign), and very occasionally, blurred vision. Diamox is contraindicated if you are allergic to sulfa drugs. It is not a substitute for proper acclimatization — it reduces risk but does not eliminate it. Always discuss Diamox with your doctor before the trip; it requires a prescription in many countries. Dexamethasone is used for treatment of severe AMS when Diamox is unavailable, but it is not recommended for routine prophylaxis.
Do I need a medical checkup before a Nepal trek?
A pre-trek medical consultation is strongly recommended for anyone with pre-existing cardiovascular, pulmonary, or neurological conditions, and is prudent for anyone over 50 attempting high-altitude routes above 4,000m. Specific conditions that require medical clearance before trekking above 3,500m include: uncontrolled hypertension, recent heart surgery or cardiac events, poorly controlled asthma or COPD, sickle cell disease, and any history of stroke or TIA. For generally healthy adults, a full medical examination is not strictly necessary but a consultation to discuss AMS risk, Diamox, and any personal medications is very worthwhile. Discuss your exact itinerary and maximum altitude with your doctor — the difference between a Poon Hill (3,210m) trek and EBC (5,364m) is clinically significant in terms of risk assessment. The UIAA Medical Commission publishes detailed guidelines on pre-existing conditions and altitude, which any GP can reference.
Is the water safe to drink directly from streams in Nepal?
Water from streams, rivers, and untreated tap sources in Nepal is not safe to drink without treatment, regardless of how clean it appears. Giardia lamblia is the most common waterborne pathogen on Nepali trekking routes — its cysts survive cold temperatures, look invisible in clear mountain water, and cause debilitating diarrhea and gut disruption that can ruin a trek. Treatment options include: boiling (100% effective, though water boils at lower temperatures at altitude, requiring longer boiling time), chemical treatment (iodine tablets or chlorine drops — effective against bacteria and viruses but not guaranteed against Cryptosporidium cysts), UV treatment (SteriPen or similar devices are excellent for Nepal), and hollow fibre filters (Sawyer Squeeze, LifeStraw — filter bacteria and protozoa but not viruses, adequate for Nepal). Buying bottled water contributes to the significant plastic pollution problem on trekking routes — carry a reusable bottle and treat your own water.
How long should I train before attempting Everest Base Camp?
A minimum of 8 weeks of structured training before EBC is recommended for people with a baseline of moderate fitness. For those starting from a sedentary lifestyle, 16 weeks is more appropriate. An effective EBC training plan combines three elements: cardiovascular endurance (building to 6–8 hour continuous activity at moderate intensity through hiking, cycling, or running), leg strength (squats, lunges, step-ups to handle sustained uphill and downhill days), and loaded hiking (practice with a 5–7kg daypack on local hikes to build the specific musculoskeletal conditioning that stair machines cannot replicate). If possible, incorporate hikes with 600–1,000m of elevation gain per session. Altitude training (if you live at low altitude) is less critical than most people assume — proper acclimatization on the trek itself is more important than pre-exposure. The goal is arriving with lungs and legs capable of 6–8 hours of moderate uphill walking daily for nearly 2 weeks.
How long does recovery take after a high-altitude trek?
Physical recovery after EBC or a similar high-altitude trek varies by individual but follows a fairly consistent pattern. Immediate fatigue and muscle soreness typically clear within 5–7 days of returning to low altitude. The body's red blood cell count, elevated at altitude for oxygen transport, normalizes over 2–4 weeks — during this period, some trekkers notice enhanced performance in running or cycling as the elevated erythropoietin effect fades. Sleep may be disturbed for 1–2 weeks after returning to sea level, which is common after sustained altitude exposure. Gut issues (from unfamiliar food or waterborne bacteria) sometimes persist for 2–4 weeks and may require treatment with metronidazole or antibiotics if Giardia is confirmed. Psychologically, post-trek blues are common — the contrast between the intense focus and natural beauty of the trail and ordinary life can feel jarring. Plan a light schedule for your first week back.