Typically, yes! Green curry has a reputation for being the spiciest type of Thai curry. The heat comes from the spicy green chiles (like Thai green chiles, or serrano peppers / jalapeños) in the green curry paste.  Don’t stress if you aren’t a fan of spicy foods. The heat is toned down once the paste is mixed with the creamy coconut milk And if you make the homemade paste, you can tailor the spiciness more granularly.