What Is Trek Fever And How To Avoid It

I want to tell you a true story about my friend Aditya.

Aditya is your average fit guy from Bangalore. He plays football regularly, sets off on short treks in the hills once a month. He goes on Himalayan treks perhaps once or twice a year.

He usually completes his treks comfortably. He comes back to Bangalore and regales me with exciting stories.

For the next few days, I don’t hear from him.

I find out he’s sick. He has a high fever.

This has happened every time Aditya has gone on a trek. After every high altitude trek, he has fallen sick.

This is not the case with just Aditya. It has happened within the Indiahikes office too.

It happened to our Trek Coordinator Vishnu when he came back from Pin Bhaba this August. It happened with our Merchandise Head Pooja when she came from Roopkund in June. 

Returning from a long trek and falling sick is what we call Trek Fever.

So why do you fall sick after a trek?

Firstly, going on a high altitude trek isn’t natural for your body. You’re constantly battling unfamiliar temperatures, terrain and altitude. You’re putting your body through a rigorous regime every day for almost a week.

To pull through, your body is eating up all available resources to keep you going — your reserve fats, your muscles and your immune system. After a point, your body is mostly pushing itself on adrenaline. By the end of your trek your body is drained.

Think of your body as a battery whose charge is slowly reducing. By the end of your trek, its charge is completely depleted.

This is where the fever happens…

When your trek ends, your body’s immune system is at its lowest. The moment you get off the hills, the pollution, grime, bacteria and viruses in the air are almost waiting gleefully to attack you. And they do.

Your body, with its diminished charge, doesn’t have the strength to fight off the bad elements.

Invariably, most trekkers fall sick. They get a bout of flu, sometimes even typhoid and jaundice.

What I want you to know is that a trek fever is completely normal, but completely avoidable too. You really don’t want a trek fever to complicate further. Worse, it may be eating into the already meagre leaves that you get at work.

Roopkund-Deepak A Jacob-I never really left
Catching a flu after spending a week in the Himalayas is quite common PC: Deepak A Jacob

How do you avoid trek fever?

There are a bunch of things you can do to avoid trek fever. I’ll put them down in points below.

1. Before your trek, run that extra mile.  

This is the most effective way of beating trek fever. The more you prepare, the more you build your body’s immune system. It is as simple as that.

So if you get extra-fit for your trek, your body has that extra bit of resource to protect you from the bad elements of the non-Himalayan environment.

To put it simply, your battery lasts longer.

If you can be consistently fit and make fitness a part of your lifestyle, as opposed to being just-about-fit for your trek, there is very little chance of you getting trek fever.

Make fitness a part of your lifestyle to avoid falling ill after a trek PC: Nikhil Patil

2. Don’t indulge in junk food after your trek

Junk food is never good for your body. Especially not at those dhabas on your transit from the base camp. No chicken legs at the nearest KFC either.

Instead, you need fresh food.

When you have no choice but to eat outside, then keep it basic. I usually stick to curd rice. If you’re not a rice person, contain yourself to plain rotis and dal.

3. Avoid sightseeing immediately after your trek

Crowded places with sweaty tourists should be last on your agenda immediately after your trek.

It’s better to go sightseeing before your trek, provided your “sightseeing” doesn’t involve bungy jumping or rafting.

If you really need to go sightseeing after your trek, give it a gap of at least two days after your trek. Give your body time to recuperate.

What do you do if you have trek fever?


Nothing works magic like resting can. You’ll bounce back to life within a few days. You really don’t need to rush to a doctor. However, after three days if you are still sick, then do meet your physician. You may need medication.  

Roopkund-Rhushabh Goradia- Finding Solace at Ali Top
Some good rest is all you need after a great trek! PC: Rhushabh Goradia

If you have faced trek fever, drop in a comment with your experience. If you would like to contribute to our study of the same, do take this 90-second survey and fill in your answers. 

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19 thoughts on “What Is Trek Fever And How To Avoid It

  1. i just returned from Valley Of Flowers trek.After i returned to Bombay on 19th aug.for 3 days i felt that all my energy has drained out.i was feeling very weak,did not feel like getting out of the bed,even if i did some little work i used to get tired.i was just wondering what is wrong with me.but today i am feeling much better.getting back to normal.

  2. Excellent points, Swati!
    Timely reminder that prevention is always better than cure!
    May I politely add a few points:
    1. Don’t join the trek if you are sick (even a mild cold & cough) or under-prepared. Postpone!
    2. Stay vaccinated (including booster doses) for Hepatitis, Typhoid, etc.
    3. Carry water purification tablets or bottles. Water is the single biggest source of giardiasis, etc.
    4. Maintain strict hygiene ( personal, hands, plates, spoons, tiffin box) during the trek.
    5. Don’t over-strain – maintaining a balanced pace (follow the trek leader’s advice) is best practice.

    1. I have a fever after a 12-mile hike at roughly 1000 feet above sea level. It began as soon as I stopped hiking.

  3. Thanks for the great advises, that’s truly helpful to be considered next time.

    I think I had it in my first & only hike I did, every night after day long trekking to high altitude my body start shaking & high fever plus losing appetite, I was fueling myself with least I can have like hot liquids & continue my trek next day.

    Now, resting was indeed helpful even when I couldn’t sleep well due to cold weather.

    After reading this article I’m grateful when I ended my trekking trip I didn’t felt sick & had my normal life activities right away 🙂

    1. Hey Thanu because it makes your body more susceptible to get acute mountain sickness on the trek. Your body is already weak which makes it more likely to not acclimatize at high altitudes. The exertion will not help the body. I am guessing that is what Aditya is trying to say. If you are running a fever, which is mostly the case if you have any sort of infection, then you should avoid going on a trek.

  4. Planning to do Great lakes this year. This is my first High altitude trek. Been to Kailash though upto North face. Didnt continue because of non cooperative guides. Did not have any health issues. Maybe I was not mentally strong. Will I have any High altitude problems in the Kashmir trek.

  5. Summited Mt. Fuji, woke up at night on the 8th station (3,400m) in a Mountain Hut feeling very weak and terrible. It was 2am and our group was heading out to finish our climb. On the decent my body started to shut down, legs aching and general soreness took over. Once I made it down, I realized that I had never felt this weak in my life. Once I got back to the hotel, I took my temperature and it was at 102.3 degrees Fahrenheit. I still have a fever and it is the next day…. thoughts???

    1. It looks like a typical case of exhaustion from pushing your body too much Andrew. This, along with the effects of high altitude. Did you have any symptoms of altitude sickness? Headache, nausea, a loose stomach?

  6. Nothing works magic like resting can. (Nothing works magic like resting. The verb “can” is unnecessary.)
    You really don’t need to rush to a doctor. However, after three days if you are still sick, then do meet your physician. ( If you are stukk sick after three days meet with your physician. The revision is one third the length and has the same message.) I am offering these corrections because of the value I place on your work. Once redundancies are eliminated, the reading requires less energy and the reader is encouraged to continue. In your case, I would continue never-the-less. Written by a fan!!