Holi, also called the Festival of Colours, is a popular Hindu spring festival observed in India, Guyana, and Nepal. On the second day, known as Dhulhendi, people spend the day throwing the colored powder and water at each other. The spring season, during which the weather changes, is believed to cause viral fever and cold. Thus, the playful throwing of the colored powders has a medicinal significance: the colors are traditionally made of Neem, Kumkum, Haldi, Bilva, and other medicinal herbs prescribed by the Ayurvedic doctors.