i was just wondering if oen cud determine mental illnesses in a person frm astrology? i know this can be done but maybe someone cud throw more light on it.

chekout moon's position and lagna's afflictions

Study of placement , aspect , positioning of Moon and bhudhikaraka mercury in a rasi and D4 chart can determine the state of Mind and mental illness

Mental Illness can be predicted from Horoscope considering Planets like Moon, Mercury, Jupiter, Saturn, Uranus, Rahu and Neptune. The House of Mind is 4th House, So consideration of 4th House and House ownwer is important.

1. If one or more Planets out of abovesaid list are retrogade with Moon Placed in 6th, 8th or 12th House, Native may have mental problem.
2. Moon Placed in  6th, 8th or 12th House with Saturn or Rahu decreases Self Confidence of Native.
3. Neech Mars (IN CANCER) is alone in Kendra with Moon in Union with Saturn decreases Confidence of  Native .
4. Uranus with Mercury in Union or Sam-Saptak (1-7) Combination makes Native Moody and and Maniac.
5. Retrogade Mercury and Jupiter with debiliated or wrong placed Moon makes Native Mentally weak causing Lack of Confidence, Speaking Problem/Lack of Expression.
6. Moon with Rahu, anywhere in Horoscope makes Native very much short tempered and an irritating character. If Mercury is Retrogade in the Chart then Native Starts quarreling with anyone.
7. Jupiter in Union with Saturn makes Native a prejudised minded person.
8. Retrogade Saturn with Retrogade Neptune makes Native Schizzophrenic (Union or 1-6 or 1-8 Combination).
9. Moon with Mars and Mercury makes Native prejudised by Nature and always shows some kind of Phobia. Some times Identity Crisis.

These are general rules. There can be more combinations. Sometimes we do a reading by calculations of Planetary Conditions but truth may be little different. If you observe and relate these facts you can find the real way to get accurate reading.

What about Rahu in 4th house??