If you have, or have had, cancer, or if you know someone who has, or had had cancer, a dream about cancer will probably reflect your real-life experiences with the disease.
Otherwise, cancer in a dream can represent anything that “eats away” at you, such as guilt, upsetting thoughts or a bad relationship.
Cancer in dreams can symbolize a negative emotion that you have been repressing, such as fear or anger, that will harm you if you do not recognize it and let it out in the open so that you can deal with it.
If you dream that you have cancer, your dreaming mind may be telling you that while you may have dealt with a problem or a difficult experience intellectually, you still have not dealt with it emotionally.