Introduction

Nepal is known as one of the world's leading destinations for exploring and immersing yourself in natural beauty and cultural richness through trekking. Ancient footpaths wind through lush greenery, riverbanks, terraced fields and wooded ridges, connecting charming hamlets and mountain villages. Trekking in Nepal is a year-round endeavor, with treks ranging from easy to strenuous, lasting from a few days to several weeks.
Trek rating system:
Nepal, being a mountainous country, is more apt to be thought of in terms of hours spent walking than miles travelled; this is what we use in our rating system. A typical day's walk takes five to seven hours and includes a series of ascents and descents.
Easy:                  
Usually 3 to 5 hours of walking each day with elevation gain below 3500m and the occasional steep path.
Moderate:         
Treks at a relatively low altitude, passes not exceeding 4500 m, 4 to 6 hours of walking every day.
Strenuous:             
Up to 12 to 15 consecutive days through the wild landscape, including high passes (sometimes covered with snow) between 4500m to 5500m, sometimes taking 7 to 8 hours. walk every day.
Very strenuous:   
Challenging long distance hikes for fitness enthusiasts, more than 8 to 9 hours. consecutive walks (but all treks have rest days along the way). Each trek crosses at least one pass longer than 5500 m. Treks to remote areas often include very rarely visited areas.
Acclimatization and altitude sickness:
Sometimes travelers face health risks mainly due to high altitude. Acute mountain sickness (AMS), which is a common problem in the Himalayan region. It can affect travelers in a variety of ways that have little to do with their age and fitness level. Acclimatization to an altitude above 3000 m requires time to adjust. The body goes through a number of physiological changes, some of which are an increased heart rate and breathing rate. Others appear slowly over weeks, such as a change in acid-base balance and the production of more red blood cells. These changes and the effect of intense sunlight, strenuous walking and dehydration can cause some mild or vague symptoms such as loss of appetite, fatigue, headache, nausea, dizziness, palpitations, insomnia, shortness of breath. 
The best treatment is prevention. Do not strain or walk too fast. Drink plenty of fluids, eat well and watch for warning signs. Limit physical activity to a minimum. If you have a history of respiratory or heart problems, please consult your doctor before embarking on one of our tours.
PREVENTION OF ALTITUDE SICKNESS
Above 2000m altitude is possible (AMS, HACE and HAPE) and above 2500m it becomes common. Approximately, above 2500 m, the maximum daily elevation gain between sleeping altitudes should not exceed 300 m (slow acclimatizers) to 500 m (fast acclimatizers), with a rest day every third day (or after every 1000 m of ascent). Above 5000 m, the daily elevation gain for slow and fast acclimatizers is halved to 150 and 250 meters per day. If you must fly or drive rapidly to an altitude of 2500 m or higher, spend a minimum of two nights at your arrival altitude (or lower if possible) or until symptoms resolve before continuing to climb. If climbing rapidly to 3000m or higher, consider using acetazolamide (Diamox).
1. Avoid excessive exertion and shortness of breath during acclimatization, especially if you have AMS symptoms
2. Drink enough fluids to keep your urine pale and rich
3. Avoid alcohol, excessive caffeine, salt and protein
4. Warning: do not climb with AMS symptoms, consult your manager/doctor.