With the Moon in the 12th house, all of your emotional boundaries are extremely diffused, and the psychic and instinctive qualities that are within are likely to be very powerful. Being strongly drawn to everything that is unifying, irrational, vast and symbolic, you’re highly imaginative but open to the collective unconscious and, thus, the feeling level of your being can be very “porous” and, at times, emotionally overwhelming.
Howard Sasportas describes 12th-house-Mooners as “psychic vacuum cleaners, they ‘suck in’ whatever is circulating in the atmosphere.” It is because this realm of your personality is frequently flooded with ideas, images, and inspiration. Hence, there’s a need to withdraw into privacy and stillness at the end of the day. You tend to be over-sensitive and will often feel extraordinarily vulnerable. And, since you possess boundless compassion and empathy for everyone, you’re often swept away by sympathy and play host to every down and out individual.
Your twelfth house moon suggests that you are a private person, hesitant to reveal your feelings and needs. Often, fearful of your vulnerability, you block awareness of your feelings; you seek refuge from your inner world in habitual activities which you may perform in an automatic manner. Contacting your hidden emotional self may be difficult for you, because you have developed a lifetime of defenses against primitive levels of need and dependency which frighten you. You may feel intense shame in regard to the child-self which is buried within you. Your Secret Self: Illuminating the Mysteries of the Twelfth House
You can be extremely shy and suffer from feelings of claustrophobia and other fears. Maybe with this particular kind of Moon you keep feelings hidden away, and experience a sense of loneliness and isolation, feeling unsupported, helpless and defenseless by some early event in childhood. Looking out towards the sea for some kind of life-line, there may be difficulty coping with daily life and so your home is often a place of seclusion, sanctuary, and retreat from the world. In astrology, the Moon rules the mother, and often reflects a parent who was hospitalized, in prison or in some other 12th house institution. This placement could symbolize that a parent may have passed away early in life, was very difficult to get hold of emotionally, incredibly sensitive, artistic, or made many sacrifices for the family.
Repressed for a long time, your sadness and longing may sometimes burst forth as infantile tears, which seem regressive and inappropriate. Like Alice in Wonderland drowning in her flood of tears, you feel overwhelmed, and seek to squelch future displays of feeling. “Be strong; don’t cry,” may be your motto. You are afraid not only of drowning in your feelings and your needs, but also of revealing your vulnerability to others, then being rejected and abandoned.”Your Secret Self: Illuminating the Mysteries of the Twelfth House