Every planet, house, sign, nakshatra shows some disease. No entity can remain all time healthy on this planet of mortal.
But, the thing is few are more troubled and few least.
Lagna is everything for an individual & 6th from it is debt/pending karma of it. Lagna is 6th from the 8th house, show lagna is pending karma of unearned things.
Above is very deep statement. You can make 15–20 other techniques from those lines.
Coming to diseases and medical astrology- So lagna is self, 6th is obstruction and pending karma & 8th is all permanent things, chronic issues.
Saturn is karaka/significator of both 6th and 8th house. For 6th house it is karaka of diseases and 8th is longevity.
Mars is karaka of 6th house as well- it shows war & accidents.
12th house is hospitals and hidden diseases- not known easily. Karaka is Saturn for bandhan/bondage, hospitals.
Sun is vitality & Moon is body & fuel of life. Lagna is engine. That’s why Moon is very important for the longevity of body. Ketu is natural karaka of deformity in body.
First see Sun- the vitality and soul. Soul enters in a particular body because of its own energies. If energies of soul is good then it will enter in a good body. Afflicted Sun gives gives diseases by birth because of past life deeds only.
Next is to see Moon- It is fuel of life. You’ve to check fuel because if fuel is less then this journey will be short. Sometimes fuel could be good in quantity but quality would be bad in such cases diseases will be there and longevity as well.
Note- It is advanced to determine whether fuel is less or bad. It is always studied w.r.t to engine or lagna.
Lagna is your engine- Engine should be good for smooth journey. If engine is bad and fuel is good then again there will diseases. Though a bad fuel will make engine bad as well.
We noted the focal points of our analysis. Now, How affliction is made?
3rd, 6th and 11th lord are malefic for health of native. 8th & 12 lord is neutral in nature, they will act as per association. Natural malefic planets Saturn, Mars & especially Rahu-Ketu harms the health.
Killer houses are 2nd and 7th, but they will harm only when they find themselves in relation with malefics. Natural malefic becoming lord of malefic houses will become more malefic and being lord of neutral house will also make them malefic.
A very important point is- birthday lord. Look for the day on which you’re born, consider vedic day system- Based on Sunrise. See the lord of the day in your chart.
Whenever Sun and Moon are placed in inimical houses from the lagna. They are weak.
Then see lagna & lagna lord. Lagna lord should be very strong for resistance from disease. Lagna lord should not be in trik houses and with maraca lords and aspected by malefics. Like- Lagnesh in 6th house, aspected by malefics and with either 7th or 2nd lord.
Take use of Navamsha- repeat the exercise in rashi tulya navamsha. Then Navamsha as independent should be read.
D-6 chart is very important. I have explained it in a video on saptarishis astrology. You should watch- https://www.youtube.com/watch?v=vzbJpSfg3yg
You should be well aware of signs, planets and nakshatra significations and diseases caused by them.
Though I am stating signification of planets, whenever they will be weak in chart then they gives diseases as per their qualities the most afflicted sign, house and planet will show diseases exactly. Like- If 2nd house is afflicted, along with Sun, Venus and Moon then issues in eyes is must. But at same time, if 8th house is afflicted instead of 2nd house, then they can give issues to genitals
Sun- bilious, acidity, vision of eyes, hair fall, acne, heart issues etc.
Moon- Tuberculosis, dryness of eyes, mensurations issues to females, mental anxiety, insomnia etc.
Mars- Cuts, wound, piles, acidity, rashes, burning, fever, brain fever etc.
Mercury- Skins problems like eczema, autism, smell issues, nervous problems etc.
Jupiter- obesity, diabetes, liver issues, hair fall, laziness etc.
Venus- eyes, kidney, sex organs, diabetes etc.
Saturn- Asthama, legs, gastric issues, laziness, unhygienic problems, cholera etc.
Rahu- Cancer, toxicity, skins issues, acne etc.
Ketu- Tumours, undiagnosed issues, new diseases, cholera, malaria, dengue, cholesterol issues.
Please read this post carefully because I have given all basic information to identify the ill-health.