The description of Ketu had given in BPHS .Ketu like Rahu has smoky appearance with a blue-mix physique. He resides in forests and is horrible. He is windy in temperament and is intelligent. Rahu and Ketu are malefic planets. If Rahu or Ketu be in the ascendant, 7th , 8th or 12th there of or be in the 7th from a Maraka lord or be with such a planet, they acquire powers of killing in their major or sub periods. For one born
in Capricorn or in Scorpio, Rahu will be a Maraka, Should Rahu be in the 6th , 8th or 12th , he will give difficulties in his Dasa periods. He will not, however, do so if aspected by or
conjunct a benefic.
Notes: Important places for Rahu/Ketu to acquire power of killing are the ascendant,7th – 8th -12th . The 2nd house is naturally added as another node will be in the 2nd when one is in the specified 8th house. They will not be Marakas , if they are in the 3rd, 9th, 5th and 11th houses. lf a node joins a Maraka planet or is in the house of a Maraka planet, it will act as a Maraka . Rahu is termed as a primary Maraka for Capricorn and Scorpio ascendants. If he is in one of the adverse houses for these ascendants his Dasa will bring death or intolerable difficulties.
Now I will explain the Ketu’s impact on severe health problems , when it coincides with natal Ketu and transit Ketu , some time it will also correlates with Dasa/Bhukti.
The sixth house is responsible for enemies and sicknesses eighth for sudden events and twelfth for hospitalization and expenditure. So now we can easily understand the aphorism .
BCP Rule: When BCP year will come on natal Ketu position, while transit Ketu also correlates to the 6th-8th-12th house or natal Ketu, then native will face serious health problems and get surgery. This is the one of the most important clues to detect the period of disease.
Case 1 : M.S. Prabhakara Sastry
Here BCP year came on the natal Ketu house (Aquarius) at the age of 52 in the year of 2012. At that fateful time, transit Ketu was moving in Aries that is 6th from Scorpio lagna. Consequently, the native got lung cancer and treated with chemo and radiation therapies.
Case 2: Sampath Kumar (Author)
Here BCP year came on the natal Ketu house (Aries) at the age of 54 in the year of 2011. At that time, transit Ketu was moving in 8th from Scorpio ascendant. The native had the surgery of hemorrhoids.
Case 3: CBC was born on July 21, 1958, at 6:40 pm, Rajahmundry, India
Here BCP year came on the natal Ketu house (Aries) at the age of 52, in 2010. At that time, transit Ketu was also making a sojourn on natal Ketu (4th from Capricorn ascendant). As a result the native had the intestines surgery, and got relief.
Case 4: Sonia Gandhi (Politician)
Here BCP year came on the natal Ketu house (Scorpio) at age 65 in the year of 2011. Simultaneously, Kethu was transiting on natal Rahu (Taurus) 11th from Cancer ascendant. Then this native had the cancer Surgery, and got relief. Note, running dasha-bhukti (Mercury-Saturn) are also linked with Ketu in natal chart.
Case 5: Akkineni Nageswara Rao (Telugu Film Actor)
Here BCP year came on the natal Ketu house (Capricorn) at age 64 in the year of 1988. At that time in transit, Ketu was moving over natal Rahu (Cancer) in 10th from Libra ascendant. In birth chart, 10th house Cancer is occupied by lagna lord, and also receiving 10th aspect of Saturn (which is roga karaka, besides dispositor of Ketu). The native had the open heart surgery, but he got relieved.