Rats keep a close relation to sickness and death. In Egypt and China they embodied the evil deity of plague. Dreaming of rats is not exactly pleasant, as they symbolize degenerative passions that are consuming you, such as rancor, jealousy, hatred, avarice, etc. It deals with those thoughts and feelings that you hide or reject, but that you have inside. If in the dream you are aggressive towards the rat it is a sign that you have the capacity to dominate the situation. However, the dream could also reference a certain attitude of the dreamer: you may be behaving like a sewer rat in real life, and your subconscious is reproaching you. Some superstitions believe that rats have human souls. Generally, their actions should be observed in dreams, and corrected if they are found in your behavior.