No. It is a gentle lubricated insertion of a sterile and smooth, disposable device with low pressure U-V filtered water. During the treatment the colon is filled with water. Once it fills up, the colon will want to get rid of this water. The peristalsis of the colon is stimulated. You will start to feel some pressure in your stomach area. This feeling will be experienced differently by each individual. It is not pain but it may be slightly uncomfortable.