Cancer is not a spirit, it is an abnormal growth of cells within a person's body. Bulimia is an eating disorder which as the attributes of other addictions. It therefore may very well have a demonic component. The demonic spirit is the 'voice in the head' that keeps after the sufferer to continually overeat and then purge by self-induced vomiting. This is more accurately called bulimia nervosa or bulimarexia. The key to freedom is to silence the voice through deliverance prayer and then exercise self-control with the support of close accountable relationships.