Fourth house is the house of shelter and is lorded over by Moon. The fierce and angry Mars is not comfortable in fourth house which showers love, affection and provides shelter from opponents. Mars is angry, impulsive and loves action. Mars loves all the cuddling and affection which is provided in fourth house. Having said that fourth house is also the house of mother and motherland. Those with Mars in fourth house are often patriotic and would die for their motherland. Many of them opt to be soldiers in army. 

     Fourth house signifies heart of the native and it also rules over old age. So anyone who has malefic in fourth house can have heart problems and troubles in old age. Mars is a natural malefic and chances of heart surgery in old age rise drastically due to Mars in fourth house. Natives must try and avoid buying property in their name and buy in name of a family member who has a better fourth house. Legal problems due to land dealings are not ruled out. Aspect on seventh house produces the worst results. This causes Mangal Dosha. Though Mangal Dosha is not as bad as it made out to be it does create frictions in marriage. Marriages are about compromise and Mars is all about fault finding and changing the wrong. Natives with Mars in fourth house should take a note to keep anger in check in a marriage and at home.  

     Mars also aspects the tenth house and eleventh house from its placement in fourth house. Tenth house belongs to his friend Sun and eleventh house belongs to his friend Jupiter. If there is friendly sign than it would boost the career. Having said that  there maybe a few changes in jobs/business profession before native is able to settle permanently in his/her choice of role. There are frictions with mother and father. Depending on horoscope sign native may settle abroad or choose a career in defence of motherland. Native could become an excellent surgeon or even an actor if other planets favor. 

     To negate the ill-effects associated with Mars in fourth house native should regularly pray to Lord Shiva and especially chant Mrityunjaya/Maha-Mrityunjaya Japa. This becomes more important if there are malefic influence on eight house as well. Ideally the native should keep anger in check in marriage and at home. At workplace it would help to remain calm and less aggressive. Avoid being too competitive with others to keep good relations at workplace. In old age native should try to regularly exercise and also do yoga and pranayam