They are unpleasant and symbolize danger, poverty, filth, and illness.
Your unconscious mind may be bringing up unpleasant images due to a disturbance in daily life. The dream’s purpose is to make you aware of negative feelings that may encourage you to directly deal with the negativity in your life. Dreaming about rats leaves the dreamer feeling apprehensive and disgusted.
Attempt to connect these feelings with those things that produce this type of anxiety during the day.