People with asthma have stood on Kala Patthar. People with type 1 diabetes have crossed Thorong La. A long-term medical condition does not disqualify you from trekking in Nepal — but it does mean the trip needs to be planned around the condition, rather than the condition being squeezed around the trip.
The Himalaya adds four things that your usual management was not designed for: low oxygen, cold, sustained exertion, and distance from medical help. Each condition responds to those differently. This guide covers the common ones, the logistics of carrying medication for weeks, and how to choose a route that keeps the margins wide.
This article is general information for trip planning, not medical advice. Everyone with a long-term condition should have a consultation with their own doctor or specialist before booking, and should not change medication on the basis of anything written here.
The General Rules
- Stable and well controlled. The trek is not the time to find out whether a new treatment works. Your condition should have been steady for several months.
- Specialist sign-off. Take your itinerary — sleeping altitudes, days from a road, evacuation by helicopter — to the doctor who manages your condition. See the pre-trek medical check-up.
- Tell your trek operator and your guide. In full, at booking. A guide who knows can act in the first minute; one who has to guess cannot.
- Carry double. Twice the medication you need, split between your day pack and main bag.
- Never in the porter bag alone. Your day's supply, and anything for an emergency, stays on you.
- A written plan. What to do if the condition flares, at what point to descend, and who to call.
- Declare it to your insurer. An undeclared condition can void the policy exactly when you need the helicopter.
- Choose the route to fit. A lower maximum altitude and a nearby road buy a great deal of safety.
Asthma
Asthma is the condition trekkers worry about most and, when it is well controlled, one of the least troublesome. High mountain air contains fewer of the common triggers — house dust mite and many pollens are scarce up there — and many people with asthma find they breathe as well as or better than at home.
- The triggers that remain: cold, dry air; hard exertion; wood and dung smoke in lodge kitchens and dining rooms; dust on jeep roads; and colds caught from other trekkers.
- Carry your reliever inhaler in an inner pocket, where body heat keeps it working. Pressurised inhalers deliver less when very cold.
- Keep taking your preventer every day as prescribed. Do not skip it because you feel well.
- Bring spares of both, in separate bags, and a spacer if you use one.
- Cover your mouth and nose with a buff in cold wind and on dusty roads. It warms and moistens the air.
- Ask your doctor for a written action plan and a course of steroid tablets to carry for a flare, with clear instructions.
- Use a pre-exercise dose of reliever before cold early starts if exertion is a trigger for you.
Breathlessness at altitude is normal for everyone, which makes it harder to judge your asthma. A peak flow meter is light and gives you a number. Wheeze that is not relieved by your inhaler, or breathlessness at rest, means stop and tell your guide — it could be asthma, a chest infection or altitude illness, and all three need attention. See Khumbu cough and chest infections.
People with severe or poorly controlled asthma, or frequent hospital admissions, should take specialist advice before considering high altitude at all.
Diabetes
People with both type 1 and type 2 diabetes trek successfully in Nepal. It takes more preparation than any other common condition, because several things change at once.
- Energy use rises sharply. Six hours of walking a day lowers blood sugar and increases insulin sensitivity, often for many hours afterwards. Most people need less insulin or medication than at home, and night-time lows are a particular risk.
- Meters can misread in cold and at altitude. Keep the meter and strips warm, in an inner pocket, and bring a spare meter. Treat symptoms, not just numbers.
- Insulin must not freeze. Frozen insulin is ruined. Carry it against your body by day and inside your sleeping bag at night, in an insulated pouch. It must not overheat on the drive in either.
- Symptoms overlap. Low blood sugar, altitude sickness and plain exhaustion all cause headache, confusion and unsteadiness. Test first; if in doubt, treat as a low and reassess.
- Illness disrupts control. Vomiting or diarrhoea can quickly become serious. Carry ketone testing strips if you use insulin and have a sick-day plan from your diabetes team.
- Altitude medicines interact. Acetazolamide alters blood chemistry, and dexamethasone raises blood sugar steeply. Both need discussing in advance.
- Meals are carbohydrate-heavy and timed by the trail, not by you. Dal bhat, noodles and potatoes are the staples. Carry your own fast-acting sugar and slow snacks every day.
- Feet need daily inspection. Blisters heal slowly and infect easily. Check every evening.
Tell your guide and your walking companions how to recognise a low and what to give you. Carry a glucagon kit if you have one, and show your guide where it is. A first trek to moderate altitude — Poon Hill or Mardi Himal — is a sensible way to learn how your body responds before attempting a higher route.
High Blood Pressure and Heart Conditions
High blood pressure
Well-controlled blood pressure is not a barrier to trekking. Blood pressure commonly rises in the first days at altitude and then settles somewhat with acclimatisation, though the response varies a good deal between individuals.
- Keep taking your medication throughout. Do not stop it for the trek.
- Ask your doctor about your particular drugs. Diuretics add to fluid loss; beta-blockers limit the rise in heart rate that exercise at altitude calls for and can reduce cold tolerance. A doctor may adjust treatment well before you travel.
- A small wrist or arm monitor is worth carrying if your pressure is hard to control. Agree in advance what readings should prompt action.
- Go easy on salt and avoid alcohol.
- Severe headache, visual disturbance, chest pain or a nosebleed that will not stop — tell your guide at once.
Heart conditions
Altitude makes the heart work harder: the resting heart rate rises, and the pressure in the lung circulation increases. For people with stable, well-treated heart disease and good exercise capacity at home, moderate altitude is often acceptable. For others it is not. This is a decision for a cardiologist, with an exercise test, not for a trekking company or a website.
- Recent heart attack, unstable angina, poorly controlled heart failure or significant rhythm problems are generally reasons not to go high.
- Anyone cleared to trek should choose a route with a modest maximum altitude and quick evacuation.
- Carry a recent ECG and a summary letter.
- Chest pain on exertion on the trail means stop, rest, and descend.
Other Conditions at a Glance
| Condition | The issue at altitude | Planning note |
|---|---|---|
| Epilepsy | Sleep loss and exertion can lower the seizure threshold; a seizure on an exposed trail is dangerous | Should be seizure-free and stable. Tell your guide what to do. Check interactions with acetazolamide |
| Thyroid disease | Affects cold tolerance and energy | Continue medication; have levels checked before travel |
| Blood thinners (anticoagulants) | Bleeding from a fall; no monitoring available on the trail | Discuss with your doctor. Avoid anti-inflammatory painkillers |
| Combined contraceptive pill | A small theoretical increase in clot risk with altitude and dehydration | Discuss with your doctor; most continue. Time zones and stomach illness affect reliability |
| Pregnancy | Limited evidence on altitude; far from obstetric care | Most guidance advises against sleeping at high altitude. Choose low walks instead |
| Migraine | Altitude can trigger attacks, and they are hard to tell from altitude sickness | Bring your usual treatment. A migraine that is not typical for you should be treated as altitude illness |
| Mental health conditions | Isolation, poor sleep and stress; some medicines interact with altitude | Continue medication. Tell your guide. Avoid sedatives at altitude |
| Sleep apnoea | Breathing disturbance worsens; electricity for a machine is unreliable in lodges | Specialist advice. A battery or solar solution is needed |
| Chronic lung disease | Lower oxygen reserve | Specialist assessment; low routes only for most |
| Anaemia | Reduced oxygen-carrying capacity | Treat before you go |
| Sickle cell disease | Low oxygen can trigger a crisis | High altitude is generally advised against |
| Severe allergy | Unfamiliar food; no emergency department | Carry two adrenaline auto-injectors; brief your guide; tell lodge kitchens |
Choosing the Right Route
Route choice is the most powerful safety decision you make. Three questions matter: how high do you sleep, how far are you from a road, and how quickly can you lose height?
| Route | Highest point | Access | Suits |
|---|---|---|---|
| Kathmandu Valley rim, Namo Buddha | Under 2,200 m | Roads throughout | Almost any stable condition |
| Poon Hill | 3,210 m | Jeep tracks within a day | A first trek with a condition |
| Mardi Himal | About 4,500 m at the viewpoint; sleeping at 3,580 m | Road within a day or two | Good control and some experience |
| Everest View | About 3,880 m at the viewpoint; sleeping at 3,440 m | Lukla airstrip; helicopter | Khumbu scenery at moderate height |
| Langtang Valley | About 3,870 m sleeping | Road at the trailhead; helicopter | A moderate-altitude valley trek |
| Annapurna Base Camp | 4,130 m | Two to three days from a road; helicopter | Well-controlled conditions, with medical approval |
| Everest Base Camp | 5,545 m | Flight and helicopter only | Specialist approval and prior altitude experience |
Remote camping routes — Dolpo, Kanchenjunga, Makalu — are many days from help and are a poor choice for anyone whose condition could need urgent care. The grading system is explained in trek difficulty grades.
Medication Logistics
- Quantity: the full trip plus at least a week, doubled if losing it would be serious.
- Packaging: original boxes or blister strips with the pharmacy label.
- Documents: a doctor's letter listing each medicine by generic name and dose, and copies of prescriptions. Essential for anything that is a controlled drug — strong painkillers, some sedatives, stimulant medication — and for syringes and needles.
- Hand luggage on every flight. Hold bags are delayed often enough on mountain flights to matter.
- Temperature: protect insulin and other temperature-sensitive medicines from both freezing and heat.
- Time zones: ask your doctor or pharmacist how to shift the timing of doses.
- Replacement in Nepal: many common medicines are available in Kathmandu and Pokhara under different brand names; specialised ones may not be. Know the generic name. See buying medicine in Kathmandu and Pokhara.
- Power: lodges charge devices for a fee, from solar, and not reliably. Bring a power bank for anything medical.
Insurance and Disclosure
Declare your condition to the insurer in writing and keep their confirmation. Policies routinely exclude undeclared pre-existing conditions, and a helicopter evacuation from the Khumbu costs several thousand dollars. Check that the policy covers trekking to the maximum altitude of your route. Our insurance guide explains what to look for.
And declare it to us. Trekkers sometimes hide a condition for fear of being turned away. We would far rather know and plan for it — it is very rare that the answer is no, and common that the answer is a better route.
We Provide This Service: Pre- and Post-Trek Health Support
Green Compass Treks provides health support before, during and after every trek, and for guests with a medical condition it shapes the whole plan. We are not medical professionals and we do not decide whether you are fit to trek — your doctor does — but we build the trip around what they say.
- Before you book: an honest conversation about which routes fit, and an altitude and access profile to take to your specialist.
- A private trek at your pace, with extra acclimatisation days, shorter stages and a spare day in hand.
- A briefed guide who knows your condition, your medication, your warning signs and your written plan, and who carries a first aid kit and, on high routes, a pulse oximeter.
- Practical help on the trail: keeping medication from freezing, charging medical devices, arranging suitable meals with lodge kitchens.
- A clear evacuation plan, coordinated with your insurer.
- Before and after: help reaching a clinic or pharmacy in Kathmandu or Pokhara, and a check-in before you fly home.
Tell us about your condition in confidence when you enquire. The earlier we know, the better the trek we can plan.
