Pithru Dosham can be classifid in many ways; it is said that the curse of departed souls, when going against their will, curses the person who defies their wish. In the Brahmin community, this can be classified to failure of performing the rituals, that are basically part of their birth Karma to perform the Pithru Karmas. In astrological point, if the fifth & 10th house lords are ill placed and the running dasa being that of the ill placed planets, this combines the Pithru dosham. There are two places mentioned in the scriptures to weed off the Curse. One being Sethu known as Rameswaram or at ThiruppullaNi and the other being Sholinghur, known as Pithru Kshetram which is situated about 20 kms from Arakkonam in Tamilnadu. Performing a Thila Homam at the former place and offering Anna Dhanam at Sholinghur are the Pariharam stipulated. The effect of Pithru Dosham in some cases only temporal and can be ridden off by offerings and pariharms. Generally, if the Karma is not performed then it lasts for three generations.If a Thila Homam is performed at Sethu, then even the life time curse vanishes!