I've had 4 colon cleanses and still feel constipated after the doctor told me that i have backed up stool in my system. what could it be?

Had an x-ray yet?: Healthtap physicians have repeatedly addressed this subject with a clear "no" answer to your question. There is virtually no value to colon flushes, cleansers, enemas, irrigation machines when the technique is accomplished to "detox" or eliminate "accumulated waste" or for weight loss. There are few real health benefits, but sigificant unjustified risk. Don't use colonics please unless prescribed.