Shani Dosha occurs when Saturn, the feared, mighty planet, is debilitated or occupies any of the Cardinal Houses (1, 4, 7, 10) in Aries, Cancer, Leo, or Scorpio or is Retrograde or Combust by Sun in those Houses (whatever be the Sign, except Libra, Capricorn and Aquarius) in a Horoscope.
Effects of Shani Dosh
Shani if unfavorably placed in a person's horoscope is known as Shani Dosha and it denotes trouble in all ways. Shani is feared by those Hindus who believe in astrology as the effects of Shani being unfavorable can be very severe. Shani brings about the bad effects of one's deed or karma and the diseases which Shani curses at physical level are poor blood supply, asthma, impotency, and tuberculosis (TB), and at mental level are narrow mind, low esteem among others and so on. Shani tests person's patience and frustrations and delays.
Remedies is shani dosha is to wear Blue Sapphire and to worship lord Hanuman every tuesday and saturday, one may also visit temple of Lord Shani.