The House that Mars occupies in your natal chart shows where you will expend a great deal of energy. Whether this energy will be expressed positively or negatively depends on the sign of Mars, and aspects to it.
Below are the interpretations of Mars in the astrological Houses. To read what Mars represents in astrology, go to Lesson 5: The Planets.
Mars in 1st House
If you have Mars in the 1st House, you have an abundance of physical vitality. Sometimes there is so much energy that you become reckless, impulsive, and throw caution to the wind. You may experience cuts and burns on your head and face which may leave some sort of scar. You are assertive, independent, impatient and want to do your own thing. You have strong organizing ability. You are usually self-confident. Guard against accidents due to rushing around in your impulsiveness. You may be subject to higher than normal fevers.
Mars in 2nd House
If you have Mars in the 2nd House, much energy and action will be expended with respect to money, personal possessions and resources. You may have trouble controlling your spending habits and are likely to be an impulsive shopper. Saving is probably not your strength, but you should try to improve your savings ability. You might sometime need it for that rainy day. Money may come and go in order to de-emphasize its importance. Concentrate on developing your talents instead.
Mars in 3rd House
If you have Mars in the 3rd House, you are restless, perhaps high-strung, and probably have an abundance of nervous energy. You have an intense belief in your own ideas. You are alert, determined, and enthusiastic. You possess an abundance of mental energy. Developing analytical thinking is important, as impulsive thinking will bring difficulties. There can be problems with siblings or neighbors. There will be many short journeys. Energy is expended in neighborhood activities.
Mars in 4th House
If you have Mars in the 4th House, there is an early striving for independence and a desire for security and a home of your own. There may be tension or antagonism in your family environment. Perhaps you are too demanding of those closest to you. You must overcome your hidden antagonisms and quarrelsomeness. Your strong emotions must be toned down and controlled. Go out and do some yard work to work off the excess energy.
Mars in 5th House
If you have Mars in the 5th House, there is a desire to be creative and you will expend much energy in that direction. You may be a gambler, a risk-taker, or a speculator. You are sports-loving and enterprising and like to have a good time. There may be some friction through children due to selfishness in past lives. Attraction to and from the opposite sex is fairly certain. Much energy will probably be directed toward dating and romance.
Mars in 6th House
If you have Mars in the 6th House, you are industrious, efficient, tireless, dynamic and active in work. You may have a tendency towards irritation and impatience with co- workers and employees who lack these qualities. You are mechanically minded with good vitality and strong recuperative powers. You tend to run fevers, perhaps higher than normal, when ill. There is a danger of burns, scalds, and accidents sustained in the course of work or employment. Many of these may happen because of impulse, haste, and impatience.
Mars in 7th House
If you have Mars in the 7th House, you are independent, like to have your own way and you must develop gentleness and diplomacy in order to avoid rubbing people the wrong way. You need to learn how to cooperate with others.
Relationships energize you and you get a great deal of stimulation from them. You desire an active partner who can help you share in the goings-on of the world. Your partner needs to challenge you, help you initiate projects and perhaps compete with you. You need a sparring partner! Your relationships have much energy and you need to channel that energy into constructive means and not into destructive ones. The competition between you and your partner might better be directed towards the outer world.
In all your dealings with others you enjoy the element of challenge and competition. You may goad others just to see how they will react. The chase is important to you, perhaps more important than the end result. Because you enjoy the action, you may not mind losing battles to a partner who is prepared to carry the fight to you. Your marriage partner is likely to be very ardent, positive, active, capable and courageous, with a will of their own. Perhaps the partner you seek is someone who can play the role of a champion or a crusader. Mars here makes for an association where the passions have full play and a love match with much devotion is possible. The tendency is to marry early, often as a result of love at first sight, although if Mars is badly aspected, you may "marry in haste and repent at leisure".
There may be strife and friction in marriage as a result of the partner's hasty temper, intemperance, extravagance, brashness, intolerance, over-demanding attitude or violence.
In order to get the best results from marriage and partnership, you should try to be as cooperative and easy-going as possible, practicing gentleness and diplomacy rather than allowing any assertive or quarrelsome tendencies to gain the upper hand.
Mars in 8th House
If you have Mars in the 8th House, there may be energy, desire, and enthusiasm for research, for getting to the heart of things, and for playing detective and uncovering secrets. There may be financial problems, probably through a partner, in order to de-emphasize the importance of money. There may be financial benefit through marriage or inheritance. There is a need to share willingly of personal resources in any cooperative relationship. You must learn to control your desires (passions) and your lower nature. There may be interest in healing or surgery.
Mars in 9th House
If you have Mars in the 9th House, your mind is enthusiastic, but restless. You are independent in thought. Your religious zeal must be watched so that it doesn't turn into fanaticism. You have strong opinions and are happy to tell anyone who will listen what they are. You have a strong desire to travel, not necessarily physically, but mentally. You have a liberal, broad, and progressive philosophy about life and do not want anyone else imposing their beliefs on you. There is a possibility of strife with in-laws. You will fight for your convictions. You may need to watch a tendency towards believing you are always right.
Mars in 10th House
If you have Mars in the 10th House, you have an ambitious, enthusiastic nature with lots of energy. You have good executive ability and organizational powers. You want to lead and show the way, taking the initiative in your career. Success comes through your own enterprise. You do best in an occupation with variety. Your self-reliance is strong and you are practical and results oriented. There may be some difficulty or friction with one of your parents or with superiors at work.
Mars in 11th House
If you have Mars in the 11th House, you have strong desires and wishes, social leadership ability and many casual associations with energetic and enterprising friends. You probably put a lot of energy into your friendships. It is important that you seek the right type of friendships. You can be taken advantage of by friends or you can take advantage of them. Active participation in group activities suits you well. Leadership within the group also appeals to you.
Mars in 12th House
If you have Mars in the 12th House, you may have intense emotional reactions and perhaps repressed desires and paranoia. People may sense this and cause problems for you. There can be trouble through slander or with secret enemies. You may have need to overcome deep, hidden, inner resentments. You may be subject to false accusations by hidden enemies. You feel an aloneness. Your energy should be directed toward gaining an understanding of the meaning of life and for the development of harmony and oneness with humanity. A love of working in secret or behind the scenes can make you effective in getting the job done.
Interpretations Credits: PHP Scripts for Astrology Websites (http://www.astrowin.org/php_scripts/index.html)