Lemongrass - In Thailand, lemongrass is used in many foods so it's no surprise that Thais know it's healthy and also a great way to cure a common stomach ache. Lemongrass has antioxidants and is also thought to kill some bacterias, so no wonder it's useful when your stomach hurts. For a stomach ache in Thailand, lemongrass is used to make either a tea (boil water with lemon grass in it for at least 15 minutes), or just cut into slices and eaten, although that's a bit too strong of a taste for some people.