Dreams are symbolic and not literal — most of the time. Cancer tumors in dreams represent a variety of unprocessed psychological and emotional materials that the dreamer may be obsessing on. They represent all of those things that bother, disturb, anger, or hurt us and that we never directly deal with or let go of. The dreamer’s mental, psychic or emotional problems may be proliferating and infecting many areas of thought and function. You may be experiencing anxiety and fear as a result of a bad habit or a certain situation in your daily life. However, if you are very worried and cannot get it out of your mind, go for a physical. When is the last time you did that anyway? In more superstitious interpretations, dreaming of cancer may be considered a dream of the contrary, but also of warning!