A Horoscope is divided into Movable, Fixed, and Dual Signs. So if Lagna is a Movable sign like Aries 1, Cancer 4, Libra 7, Capricorn 10, then the 11th house is Badhak. If there is a Fixed sign like Taurus 2, Leo 5, Scorpio 8, Aquarius 11, then the ninth house is Badhak. If there is a Dual sign like Gemini 3, Virgo 6, Sagittarius 9, Pisces 12, then the 7th house is Badhak for the Horoscope.
The purpose of Badhak in a chart is to bring obstacles and challenges in one’ s life and if Badhak is ill-placed then it can give diseases to the body.