Leech Bites on Nepal Treks Guide

Overview

Terrestrial leeches are present on trails below 3,000 metres across Nepal, particularly active during and after monsoon season (June to September). They inhabit moist leaf litter and vegetation alongside trails and attach to passing animals and humans without being felt — they inject a mild anaesthetic along with their anticoagulant saliva. You typically discover them only when you notice blood on your sock or skin.

The correct removal technique is to slide a fingernail, credit card edge, or stiff leaf under the leech's sucker and flick it away. Do not pull, burn, or salt the leech while attached — these methods cause the leech to regurgitate into the wound, increasing infection risk. After removal, clean the bite with antiseptic. Bites often bleed for 20-30 minutes due to the anticoagulant — this is normal and resolves without treatment.

Prevention is more comfortable than treatment. Tuck trousers into socks or use gaiters on low-elevation monsoon trails. Leech socks — tightly woven cotton or wool socks pulled over trouser bottoms — are sold in Kathmandu and are highly effective. DEET-based insect repellent applied to boots and trouser ankles deters leeches, though it needs reapplication every two hours.

Leeches do not transmit disease in Nepal. The only genuine risk is secondary bacterial infection from scratching the bite site. Keeping the wound clean and applying antiseptic cream is sufficient treatment for the vast majority of bites.

FAQ

Q: Are there leeches on the Everest Base Camp and Annapurna Circuit routes?
A: Leeches are common on the lower sections of these routes (below 2,500 m) during monsoon. Above 3,000 metres they are absent.

Q: What should I do if I cannot remove a leech?
A: Any lodge or teahouse can assist. Staff deal with leech bites routinely and will remove it safely.