Seat of disease.
Adhomukha stars (that look downwards :) Indicate below navel diseases
Urdhvamukha-- Above Neck -Rohini/Ardra/Pusya/U.Phalguni/U.Asadha/Sravana/Dhanista/Shatabisha/U.Bhadra
Thiryugmukha- Below the neck above navel — Shoulders, chest ,heart ,stomach ,bowels etc ( Mrigashira/Punarvasu/Hasta/Chitra/SWati/Anurdha/Jyhesta/Revati/Ashwani .
If a rises there will be attainments after endeavours.
Another mehod- If the lagna i (3,6,9& 12)From sun , Disease is below the neck and above waist .
If Lagna is (2,5,8&11) from sun up till the neck.
If Lagna is ( 1,4,7,10) from sun Below the waist disease.
Third method – As per William andrews mentioned in book The astrological Phystian .
If the Lord of the sixth house be in the ten first degrees of a sign e, the upper part of that member, signified by that sign, is most afflicted, if he be in the middle of a sign e, the middle of that member signified thereby, is most oppressed, if in the latter part or last degrees of a sign, the lower part of that member represented thereby is most afflicted. As for example, the lord of the sixth house, at the time of the propounding of the question in Cancer, in the first part thereof, then we may judge the upper part of the Stomach to be afflicted by such diseases as are incident to the upper part thereof, of the nature of the Lord of the sixth, the like may be observed by any other sign.