Vedic Astrology says that the Ascending sign, the sun and the Moon constitute the three legs of a horoscope. Even one is defective the horoscope becomes instable and can topple at any time.
So for a long life Good health is essential. For Good health the Ascendant, its lord, the Sun and the Moon have to be strong.

Vedic astrology deals with health in a very detailed manner assigning body parts and its elements to the 9 planets.  So each planet becomes significator of a certain part of the body. The diseases have been classified under three broad groups falling under Kapa(phlegm), Vata, (wind related) and pitta (bile related) and those which are inclusive of all.

Medical astrology is a separate field in which an astrologer can spend his life time in learning and prescribing remedies.

Any planet which is weak in strength the parts controlled by that planet will be weak as well. Any planet associating with malefic planet will manifest complications in that body part. To quote an example when sun is afflicted and weak, the right eye suffers from some kind of vision defect.

The Vedic seers nominated the sixth house as house of diseases. Planet in 6th, planet associated with Lord of sixth and houses where sixth lord is placed indicate the body part that is likely to suffer. The ascendant lord in 6th gives poor health. Since 6th is related to diseases it has a prominent role to play in the horoscope of Doctors.

Seeing the effectiveness of astrology many allopathic doctors have learnt astrology and after analyzing the horoscopes and instrumental diagnosis are able to come to correct conclusion about the disease to give best possible treatments to their patients.

Longevity:- This is another topic which has been exhaustively dealt with in Vedic astrology.

There are various methods available for determining longevity of the individual.
The life of a person is broadly classified as Infantile death (up to 12 years), Alpayu or short life up to 30 to 35 years, Madhyayu middle life from 35 to 70 years and Deerghayu or long life which can extend up to 120 years.

Various combinations of planets for each category of life length have been given and so far they have stood the test of time,

So to begin with an astrologer sees to which group the horoscope belongs and then starts tabulating the length of life by any chosen method.

The dasa systems which are unique to Vedic astrology help in arriving at the point which roughly indicates the end of life. Raahu acts as terminator hence his transit becomes crucial at the time of death.

The houses 3rd and 8th are houses of life and the 2nd and 7th are houses of death. Planets related with 2nd and 7th bring about death t the appropriate time.

Saturn in his cycle of 30 years reaches a point from where he can aspect the crucial houses of life indicating the end of journey.

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