What are land leeches and how are they dangerous for tourists?

Land leeches are small parasites that travelers often encounter in tropical countries such as Thailand, Sri Lanka, Laos, and Cambodia. In most cases, they are harmless, their bite is painless, and the consequences are limited to small bruises and itching, which occurs not from the bite itself but from possible dirt getting into the wound. Blood may flow from the bite for several minutes to tens of minutes due to poor clotting, but leeches do not carry infections.

However, there is a rare but dangerous disease—hirudinosis, when a leech penetrates body cavities (e.g., through the mouth, nose, or other natural openings) and remains there to live and reproduce. Such cases are isolated, but it is important to remember precautionary measures, especially when visiting humid forests or swampy areas.

If you are planning a beach vacation, encountering leeches is unlikely, but for trekking, hiking, or jungle tour enthusiasts, the risk increases significantly. Do not panic when you meet them—simply follow simple protection and removal rules to minimize discomfort.

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