Although there are plenty of different varieties of snake in Thailand, the vast majority of foreign visitors are unlikely to see one outside of a zoo or a snake farm.
If you are going trekking, it should go without saying that you are advised to use a reputable guide who will advise you on precautions. Typically it will be a case of wearing long trousers and covered shoes to avoid the possibility of leeches, scorpions or centipedes. A bite from a giant centipede can have serious consequences so keep well away. If you are staying overnight in jungle areas, shake out your shoes and clothing in the morning because these are favourite hiding places for scorpions.
Surprising as it may seem, if you do come across a snake in the wild it’s going to be as scary for the snake as is it is for you. Most snake bites are a result of harassing or trying to kill the snake. If you leave them alone you are unlikely to get bitten. Seeing a snake in the wild will probably have more of an affect on your laundry bill than your medical bill! In the exceptionally rare event that you do get bitten, seek out immediate medical help but don’t panic as single snake bites are rarely fatal. Providing a description of the colour and size of the snake will help.
Don’t be put off visiting Thailand by the prospect of snakes, scorpions or other creatures. It’s important to get dangers in perspective. By far the most common cause of injury to foreign tourists in Thailand is road accidents, especially motorbike accidents.