Mars Synastry: 12th House Overlay in Astrology

What happens when your Mars falls in someone's 12th house? What happens when their Mars falls in your 12th house? Find out!

12th House Mars in Synastry


12th house Mars in synastry does not mean your relationship is doomed.

When someone brings their Mars energy to your 12th house they activate your 12th house personality components.

Mars brings an assertive, aggressive, active, challenging and energizing influence to your 12th house.

The 12th house is about secrets, fears, the subconscious, criminal activity, spirituality, ghosts, dreams, meditation, retreat, solitude, imprisonment, museums, hospitals, institutions, merging, imagination, the intangible, and that part of you that you can’t see well, and can be the self-undoing.

Any planet in the 12th house is aiming for something beyond its grasp. The 12th is ultimately beyond our comprehension, beyond logic, and personal planets here push us out into unknown territory.
— Lynn Bell, The Mars Quartet: Four Seminars on the Astrology of the Red Planet

Someone's Mars falls in your 12th house

When someone’s Mars falls in your 12th house you may feel that you have nowhere to hide. These people actively engage the parts of you that you’d rather ignore or that you didn’t realize existed. How well you respond to someone whose Mars falls in your 12th house depends on how open you are to facing your fears and clearing out your psychic junk. Maybe you don’t want your 12th house activated. Maybe you don’t want to remember your dreams. Maybe you don’t want someone pointing out your bad habits.


The positive is that, if the Mars person has your best interests at heart, he or she can help you acknowledge and overcome the habit patterns that hold you back. This person can become a great ally in your spiritual growth. This person already knows how to actively use the energy that you are barely able to recognize in yourself.


The negative is that, if the Mars person is selfish and self-serving, he or she may use their knowledge of your bad habits, blind spots and personality weaknesses to manipulate or hurt you. You may have trouble seeing this person’s actions for what they are. At the extreme this person might actually encourage you to become your own worst enemy.

Your Mars falls in someone's 12th house

When your Mars falls in someone’s 12th house you are the one poking into the other person’s secrets. You are the one being aggressive and nudging them towards something unknown. You may be the initiator in the relationship.


The positive is that you can help the 12th house person get to know himself better. You can encourage the 12th house person to open up about secrets, share sorrows, and help this person release internal grief and trauma. You may find a shared interest in spiritual activities. The 12th house person can help you learn to relax and let go of the need to be doing things. You may find your actions becoming increasingly spiritually-oriented and you may find yourself acting more strongly from a place of inner knowing.


The negative is that you may feel the 12th house person doesn’t appreciate all that you do for him. You may feel that your efforts get taken for granted. You may feel that the 12th house person doesn’t acknowledge your sexual needs. You might feel that the 12th house person doesn’t find you sexually attractive. It may seem that no matter what you do, the 12th house person doesn’t notice your advances. You may begin to think that your actions are futile.

Family Relationships

The relative who has your back, or the relative who stabs you in the back. The person who accepts you and with whom you can be yourself. The relative who makes you uneasy. Unspoken sexual tension that disturbs your sleep. The uncle who stares too much. The family members who encourage your bad habits and sabotage your progress.

Work Relationships

Sexual undercurrents in relationships with coworkers or supervisors. Affairs in the workplace. Flirting on cigarette breaks. Sexual excitement discussing favorite TV shows and such. The office romance that doesn’t go anywhere. There’s no chemistry outside of the secret shared moments.

Romantic Relationships

Sexual fantasies. Unrequited love. Love affairs that go nowhere. Your partner never wants to introduce you to his parents. Your girlfriend keeps you a secret from her friends. There’s a lot of attraction but nothing happens. Hit it and quit it. The fantasy is better than the reality. You meet your partner in AA. Your partner may encourage your bad habits or help you overcome them.


Your best friend who lifts you up when you are down. The person you trust your secrets to. “I’ve never told anyone this before!” Your best friend keeps you apart from the rest of his friends. You feel ashamed of this friend for some reason. Your friend’s faults make you feel uncomfortable. Your friend encourages your bad habits.

If you are the 12th house person

If you are the 12th house person you will have to actively notice and acknowledge the Mars person’s efforts. You will need to make a conscious effort to make this person feel sexually attractive (if it is a sexual relationship). You will have to be willing to confront your bad habits and deal with them.

If you are the Mars person

If you are the Mars person you will have to learn when to back off and allow the 12th house person privacy and solitude. Not all secrets need to be shared. You will learn to relax a little. Be wary of the selfish motivations behind your actions and the impact they may have on the 12th house person.

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Mars Astrology Keywords

  • Anger & Rage
  • Force & Coercion
  • Drive & Will
  • Competition & Rivalry
  • Impatience & Impulse
  • Guts & Daring
  • Sharp Edge of the Blade
  • Initiating & Pioneering
  • Antagonizing & Bratty
  • Straightforward & Uncomplicated

Get your own 12th House patch at ASTROFIX @ Etsy

12th House Astrology Keywords

  • Institutions, Hospitals, & Prisons
  • Retreat, Meditation, & Sleep
  • Supernatural Phenomena
  • Time Spent Alone, Confinement, Release, & Escape
  • Spiritual Development & the Vast Unknown
  • Fears & Phobias
  • Blind Spots
  • Self-Sabotage
  • Secret Enemies
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