Medical science has been an integral part of Astrology from ancient times. In fact, Ayurveda is closely linked to Astrology.

In ancient times, practitioners of Ayurveda had made it a point to acquire a knowledge of Astrology for they had realized the value of Astrology for the purposes of diagnosis and prognosis of disease. 

The horoscope of a native clearly indicates the types of disease he is prone to, the part of the body that is likely to get affected and the probable time of the occurrence of the disease. 

Astrological knowledge helps not only to prognosticate and diagnose the disease, but also avert it by preventive medicine or other treatment recommended by medical science. 

The Rashis (signs) Houses or Bhavas
The astrologer can build up a medical profile of the native by a perusal of the placement of planets in Signs and Houses. 

Zodiacal Signs
The signs help localize the site of the physical lesion, defect or the disease for the signs rule the specific parts of the anatomy which are as follows: 

• Aries: Head
• Taurus:  face, throat
• Gemini: shoulders, neck, upper chest and arms
• Cancer:  Chest and breasts
• Leo: heart, solar plexus
• Virgo: Upper abdomen up to the naval.
• Libra: Lower abdomen, lower back and loins
• Scorpio: External genitalia
• Sagittarius: Thighs
• Capricorn: Knees
• Aquarius: Legs
• Pisces: feet

This site allocation helps determine the region already afflicted.

Determination of the nature of the disease
The Ayurvedic classification of humors or Dosha or basic elements influencing health such as Vata (Wind), Pitta (heat), and Kapha (Phlegm) serve as a pointer to the medical profile or the health status of the native. 

  Fiery signs represent Pitta, watery signs Kapha and airy signs predominantly Vata. However, Earthy signs are sub-divided as Taurus as representing Kapha and Virgo and Capricorn 
representing Vata.