It rarely is. Usually, painful experiences are the result of resistance and tension, or very specific bowel problems.
You will be put at ease during your treatment thus minimizing discomfort.
Most people actually enjoy the colonic and are especially pleased with the unaccustomed sensation of feeling lighter, clean and clear afterward.
Sometimes during a colonic, the colon muscles will contract suddenly expelling considerable amounts of liquid and waste into the rectum. This may feel like cramping or gas, and may create a feeling of urgency to empty the rectum. Such episodes, if they do occur, are brief and easily tolerated.