Ghosts are often associated with fear in the dream dictionary. It turns out that there is truth to the saying that we fear what we do not understand. Ghosts as a dream symbol are usually just as feared. Usually the dream meaning of a dream involving ghosts has something to do with fearing a part of yourself. The ghost may symbolize some kind of painful or repressed memory that you might have had since childhood. Sometimes the identity of the ghost in the dream can help you understand what the memory is related to, though this is not always the case. Some dream interpretations suggest that a ghost in a dream could just exist as a symbol for your fear of death. Of course, ghosts are strongly associated with death, and can easily be seen as symbols of death because of this.
Generally the meaning of dream regarding a ghost that is of no person special to you has a more general message. When it is the incorporeal manifestation of someone that you have known for quite some time, then it is important to figure out exactly what significance that person has to you, and why they might show up as a ghost in one of your dreams instead of in their normal human form. Most dream meanings regarding dead relatives or friends are tied to feelings of guilt that you had. If the people that you are seeing as ghosts in your dreams are actually dead in the real world, then it is likely that you are dreaming of them because of some wrong that you committed against them while they were alive that you cannot get over.
If you dream that you are attempting to reach out to a ghost that then disappears, a dream interpretation might suggest that you are attempting to deal with some painful or stressful memory, but that you have not quite become completely at ease with it. Still, you are taking steps to do so, and this might be the dreams' way of telling you that you are making progress.
If the ghost of a person that you see in your dreams happens to be someone that is actually live, this is a dangerous sign. Contrary to how it may seem, it could mean that they are plotting something dangerous for you. You would do well to spend some time apart from this person until the dreams have settled down or gone away entirely. This is why it is important to carefully scrutinize the people in your dreams and the things that they do, because it clues your conscious self into what your subconscious feels. If you feel deep in your gut that you are in danger, this is your subconscious' way of telling you, and you would do right to listen.