Thai food can be spicy, sometimes very spicy. Generally Thai restaurants wish to protect their foreigh customers from excessive spiciness. It normally takes few visits to a restaurant to be able to get the food with similar spiciness what the Thais are offered.
Here is the simple 5 step Thai food spicy index based what the food does to our anatomy.
Bonus image: The only way to take a food photo to be shared on Facebook. When the food is good enough, there is no time to take 'before' photos.