On a mountain trek, first aid has one purpose: to stabilise a problem so you can safely get yourself or a companion to proper care. It is not about carrying a pharmacy on your back. The most useful pieces of first aid kit are knowledge and judgement, which is why a basic wilderness first aid course is one of the best investments any regular trekker can make. This guide covers what to pack and how to think about the common issues you are actually likely to meet on the trail.
What Goes in the Kit
Keep the kit small, waterproof, and accessible near the top of your pack. The essentials are: adhesive bandages in several sizes, leukotape or sports tape (the single most useful blister item), a few sterile gauze pads and non-stick dressings, antiseptic wipes, a small elastic bandage, a triangular bandage that doubles as a sling, tweezers, small scissors, disposable gloves, and a safety whistle. Add an emergency foil blanket, rehydration salts, and water purification tablets or drops. For medications, most trekkers carry a pain reliever such as ibuprofen or paracetamol, an antihistamine for allergic reactions, and an anti-diarrhoeal. Anyone with known severe allergies should carry their prescribed epinephrine auto-injector. Check expiry dates before every trip and replace anything you have used.
Blisters, Cuts, and Sprains
Blisters are the most common trek injury and the most preventable. The moment you feel a hot spot, stop and tape it with leukotape or a blister plaster — pushing on is how a hot spot becomes a blister and a blister becomes a trip-ender. For cuts, clean the wound with water or an antiseptic wipe, apply direct pressure to stop bleeding, and dress it with a sterile pad held by tape. A twisted ankle is managed with rest, ice or cold water if available, compression from your elastic bandage, and elevation — the classic RICE sequence. If you cannot bear weight on it, the trek is over for the day and you need to plan an assisted descent.
Stomach Bugs and Water
Gastrointestinal illness can dehydrate you fast at altitude, where fluid loss is already higher. Drink only treated water on trek — boil, filter, or chemically treat everything from streams and taps you are unsure about — and be rigorous about hand hygiene before eating. If diarrhoea strikes, sip rehydration salts frequently in small amounts; if you cannot keep fluids down for many hours, that is a medical emergency, not a wait-and-see situation. Carry medication for stomach cramps and nausea as well as the anti-diarrhoeal.
Altitude Problems
Above roughly 2,500 metres, know the warning signs of altitude sickness: headache, nausea, unusual fatigue, and poor sleep are early symptoms that usually improve with rest at the same altitude and plenty of fluids. The non-negotiable rule is never to ascend with worsening symptoms — stop, and if symptoms do not improve, descend. Confusion, loss of coordination, or a persistent cough with breathlessness are emergencies: descend immediately and seek medical help. There are whole guides on acclimatisation strategy; the first aid lesson is simply that descent is treatment.
When to Call It Off or Call for Help
Serious bleeding that does not stop with pressure, any head injury with confusion or vomiting, suspected fractures, chest pain, signs of heatstroke or hypothermia, and worsening altitude symptoms all mean the same thing: stop the trek and get help. Three blasts on a whistle is the international distress signal. Before any trek, leave your route and expected return time with someone reliable, and know the local emergency number. The best first aid kit in the world is useless without a plan — make yours before you leave home.
Arjun Mehta is the pen name behind Mountains Bliss — practical mountain-travel guides with routes, costs, seasons and safety notes, researched from real trekker discussions and cross-checked before publishing. No sponsored posts, ever.
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