Rahu in 8th house in Astrology makes the person’s life very difficult in terms of health and accidents. This is one of the worst positions to have Rahu in. Ketu, however, in the 8th house is far better for long life. Rahu not only gives accident, but it could also lead to jail time. This Rahu however produces a doctor and a surgeon with a good aspect on Rahu. Most people in the medical field have Rahu in the 8th house in Vedic Astrology.
This 8th house rules the death and rebirth of a person or how one rises after a great fall in their life. This house also shows money through in-laws and friends as in loans you might get from them. Financial loans for home, business is also shown from this house. Deep-rooted issues of one's life, and one's interest or lack thereof in the mystical world such as astrology, magic, tantric practices, ghosts are shown from this house. 8th house also represents the life span of a person. This is simply the house of the occult. Secret affairs are also seen from this. Government taxes, spies, and business-related to secret government dealings are seen from the 8th house.
After marriage, a lot of readjusting is required. There is a separation of the family one was born in, and one's own stability and integrity are tested. It is a stage in life that can be very vulnerable. If one does things right at this stage, the foundation is in place for long healthy life. This stage is a junction point of past and future, and the 8th house indicates Astrology for that reason.
The 8th house corresponds to the lowest part of the trunk, the genitals, anus, and eliminatory system.
Scorpio corresponds to the 8th house. Fixed, but ruled by the forceful Mars, add the signification of sudden calamities to the 8th house. On the positive side, the sharp and analytical Mars can also add an element of research to this house.
Rahu is the north node of the Moon and is a head without a body that keeps devouring things without ever being satisfied. It has a desire for material things and worldly accomplishments. It wants to achieve the highest success possible in whatever house and sign he represents. Rahu represents the goals that have been set by the universe for us to achieve whether we like it or not. Rahu is mainly known as the eclipse, and it eclipses the Moon and the Sun whenever it's in conjunction with them.
This means temporary darkness upon the native's life when the Sun and Rahu are in conjunction in a birth horoscope. Rahu also brings fear and stressful situations into our lives. This is due to Rahu's adventurous nature that loves surprises. With Rahu, sudden events take place; events that may not be a real part of our lives but rather an illusion that becomes reality.
Rahu in Vedic Astrology is a very unsteady and erratic force ruled by obsessive passions and unconcerned with ethical notions of right and wrong. Because of this, Rahu can bring great material progress, though any success gained under its influence is likely to be short-lived. Rahu is tricky and sneaky and creates illusions of all kinds. It especially manifests in one's compulsions of uncontrollable passions.
Note: The degree of auspiciousness and inauspiciousness will depend upon a complete analysis of the horoscope (birth-chart).