Whenever one speak about suddenness in one’s life, its the eighth house which comes into effect. Eighth house of a vedic chart from the ascendant also shows matters related to excretory organs, bladder, scrotum and anus. Piles, fistula and other diseases of the rectum are also represented by the eighth house from the ascendant. When a native speaks about incurring loans and debts, the same is analyses from the eighth house. Eight house has also a lot to deal with ones mental and physical stress. Eight house deals with defeat, insult, sorrow, punishment given by the Government and severe difficulties. A strong eighth house also leads to an inborn ability to manipulate people or colleagues.
The best part of the eight house is ones journey to go deep inside the forests, getting lost and coming back again, crossing water bodies across oceans, a strange path deep inside the mountain terrains, which are reflected through the eighth house of ones chart. Financial matters related to legacy and inheritance is also seen from the eighth house.
Eighth house rules many aspects of life and it depends on the strength of the lord of the house, placement of planets in the eighth house, level of activity of the planets in the eighth house and the mahadasha, antardasha etc of the eighth house.
The above write up is a general prediction and these are my personal views which may not match with astrologers. This is based on my experience of reading this subject and looking into the practicalities of the situation based on horoscope analysis for all these years.