Mars in the sixth house is the most ideal location for it. Sixth house is the house of enemies, debts and diseases. Mars provides aggression and competitive attitude which sees native overcome the difficulties associated with this house. As long as Mars is strong or placed with Moon in sixth house native does quite well. There is an ideal career in sports. Over and above native may also make a wonderful career at any place where competitive nature is required. Also favorable are career as a human rights activist, as a surgeon and as an engineer.

   Two negatives make a positive in mathematics. Similarly in astrology a malefic planet in a malefic house provides a strong and favorable result. More than that it is the character of Mars which enables the native to gain victory over matters of the troublesome sixth house. The aspect of Mars on ninth house is in the house of its friend Jupiter. Only flaw could be the aspect on twelfth house which is the house of Saturn. The aspect on first house provides the native with a fierce and competitive attitude. Mars in sixth house does bring a fair share of disease, debt and enemies. But native should be able to overcome those with the energy and aggression. If Mars lacks strength and is influenced by malefics in sixth house than he may have problems from enemies. The downside of Mars in sixth house could be bad subordinates and not getting on well with them. 

     Mars in sixth house is generally favorable. It gives victory over enemies. It is better for natives to opt for a sporting career or any place where there competitive nature is seen as an asset. Career as a surgeon or engineer is also a possibility. Native should try and pray to Lord Karikeyan or Lord Hanuman to increase the good effects of Mars in sixth house.