Lemongrass, Cymbopogon citratus, can help with a variety of common ailments, like anxiety, common colds, fever, inflammation, and insomnia. When taken orally, lemongrass is often used to calm stomach discomfort and other gastrointestinal issues, including cramps and vomiting. Lemongrass tea is known to treat stomach ailments, indigestion, and gastric ulcers by protecting the stomach lining.