It is mentioned in the Brahma Puran that, on the eve of Krishna Paksh of Ashvin month the Lord of death “Yamraj” grant freedom to all the souls so that they can accept and eat the food made by their children on the occasion of Shraad. The peoples who don’t do the Shraad for their Pitras are the one who suffers from the curse of “Pitra Dosh” as their Pitras got angry and returns to their world. Due to this the upcoming generation have to face many problems. This is what we say is “Pitra Dosh”.
In this world a person’s death can be classified in two ways i.e. natural death and immature death. Natural death takes place due to the God but the immature death occurs mainly because of “Pitra Dosh”. We have seen the sudden deaths of Rajiv Gandhi, Harshad Mehta, Pramod Mahajan, Indra Gandhi, Sanjay Gandhi, Subash Chandra Bose, Dayna and the upcoming singer Ishmit Singh which attracts our mind towards the “Pitru Dosh Nivaran”.