Holly basil is a common ingredient in treatments for colds and flu. It is the perfect digestive and is a simple remedy for gastritis, irritable bowel, indigestion, flatulence, nausea, and vomiting. As an antispasmodic, it is useful for any stomach or intestinal cramping, including those caused by irritable bowel syndrome, peptic ulcer, gastritis, and pre-menstrual syndrome. Holy basil is also used in treatments for easing headaches, cough, sinusitis, and arthritis. While the herb may be used to combat constipation, the seeds are more effective laxatives. Some Hill-Tribes use basil in the steam bath or sauna for eye infections or pain, and topically as a poultice for fungal infections.