Sarpa Dosha is also called Naga Dosha. This dosha occurs when the Serpent God is in extreme anger in the previous birth. Rahu is the head, and Ketu is the tail of the Sarpa (serpent). Sarpa Dosha has no specific time limit.It is a malefic dosha and indicates that the individual afflicted by this dosha may have engaged in acts of violence against snakes in his previous life. He could have mistreated them or killed them in his past life.