Mars in the 1st House

The 1st house is the house of "Self".  It is home to our ascendant/rising sign and is associated with self-image, our style of initiating things, and how others notice us in a first impression or superficial setting.  It is the house through which we consciously perceive the world and how it perceives us.  Any planetary placement within the First House will be more pronounced in the individual's personality.

Mars is the planet of energy, action, and sexual desire, and when placed in the first house, the native has an abundance of physical vitality.  You are assertive, independent, impatient, and want to do your own thing.  You have strong organizing ability and are usually self-confident. 

Sometimes there is so much energy that you become reckless, impulsive, and throw caution to the wind.  Guard against accidents due to rushing around in your impulsiveness.  Aries rules both Mars and the head, and if your Mars is poorly aspected, you may experience cuts and burns on your head and face, which may leave some sort of scar.  You may also be subject to higher-than-normal fevers.