If Rahu is in the 1st house, it is bad for domestic happiness. There will be constant ups and downs in the married life. Peaceful or stable periods are short-lived, as there is always some problem arising to be dealt with. Rahu, being malefic, is bad for health, longevity, and confidence. There will be a big ego, but since Rahu destroys the confidence, the result is a kind of egocentric, or self-indulgent, personality. There is a struggle throughout life for self acceptance and a positive self-image. The person is odd, eccentric, or out of the ordinary. He will be wealthy, as Rahu signifies worldly desires and benefits. He will also be inclined towards spiritual or occult subjects. The health problems caused by Rahu will be due to upset emotions or negative thinking. These illnesses will be difficult to diagnose and hard to cure except through diet or natural remedies. Rahu in the 1st will give physical strength and a strong will. The person defeats his enemies or competitors. The marriage partner may be of a spiritual or ascetic nature. He may also be devious or deceitful. Rahu, because it rules worldy benefits, in the 1st house often gives extraordinary beauty.

UCHCHA (exalted). Regarding Rahu and Ketu, the only placements agreed upon by scriptures and astrologers are Mercury's signs—Gemini and Virgo. Either node flourishes in both signs. If Rahu is in Gemini or Virgo in the 1st house (or stationary direct or in forward motion), the person will be honored or famous. He will be a very strong personality and a leader in his field. He easily gets the better of his competitors. He will be both wealthy and spiritual. He will have a handsome or prominant appearance and be intelligent. Married life will suffer in the same way as described above.

NEECHA. There is no agreed-upon fallen position for Rahu. However, it is poorly placed in Cancer and Leo, since it is an enemy of the Sun and Moon. In either of these signs, the negative effects already mentioned above may be heightened.

Rahu gives its full effects in the 42nd year. Unless it is well placed or well aspected, there may be health problems or difficulties in married life at that time. There may also be changes in one's position or status.

Source: «Ancient Hindu Astrology for the Modern Western Astrologer» by James Braha