One can choose from an easy trekking to Namche Bazaar starting from Lukla to the strenuous 3 to 4 weeks long trekking starting from Jiri. The trekking from Jiri involves many ups and downs. All the rivers in this region flow south from Himalayan glaciers. The trekking which begins from Jiri proceeds east. Therefore the trail must climb to the ridge that separates two rivers, descend to the river itself, and ascend the next ridge. Most Everest trekkers opt to fly one way to avoid having to repeat all those ups and downs. The trekking in Everest region is more strenuous than those in Annapurna region. The addition cost of air tickets makes the trekking a little more expensive. You gain height too quickly in this region. Hence it is very likely that the trekkers in the region will have Acute Mountain Sickness (AMS). The acclimatization days in the trekking, a routine practice, prevents to have AMS. Of course it increases number of days in the trekking. If one acquires the symptoms of altitude sickness then s/he may not be able to go to the Everest Base Camp. But it is still worth while to visit other Sherpa villages like Khumjung, Thame, Thengboche monastery, etc. The Monastery in Thengboche is highest monastery in Nepal. The Everest region has numerous minor peaks which are open for trekkers who want to have more adventure trekking in Nepal. The most famous peaks as Mera, Island, etc. The most popular trekking in Everest region are Everest Base Camp via Kalapattar and or Gokyo. The Everest Base Camp trekking is among Top Ten Trekking in the world. You may click here for Trekking Itineraries.