The study examined the use of medicinal herbs of the Phu Thai ethnic group at Nom Klao Village, Tambon Bung Khla, Lerng Nokatha District, Yasothon Province. The investigation covered how to use medicinal herbs for healthcare, how to make them into medicine, how to store them, how to concoct them, types of herbs, where to collect them, and what ailments could the herbs be applied. It was found from the investigation that most patients seeking treatments from herbalists had received modern medical treatments from state hospitals before. When their symptoms did not improve, they turned to herbal treatments. The sicknesses included diabetes, AIDS, hemorrhoid, cancers, and others.