I was once bitten by a scorpion on Koh Samui, and the pain was bad for many hours after! It was dark so I do not know what scorpion it was. Had some regular painkillers but they did not work at all. Took about 10 hours before the pain was gone. I did not go to hospital due to reasons I will not mention here. I was also stung by a bee last trip, but that pain was not nearly as bad. But my finger became discolored for many days after.
Another nasty flying thing is something that looks like a very big wasp!
It was stuck under the helmet and stung me, Painful and I was dizzy and felt like <deleted> the whole day. Lol! This has happened over a period of 35 years, so I think I can say it is "safe" in Thailand as long as you are aware of these insects. They are a bit more poisonous than the types we have in Europe. 😂😁