Some dangers associated with colon cleansing include harmful side effects such as nausea, vomiting and kidney failure, according to WebMD. Additionally, people may become dehydrated and are at a greater risk for bowel perforations and infections, states Mayo Clinic.
The human body is designed to detoxify itself, notes WebMD. A healthy human being has no reason to perform a colon cleanse. Some people state that undergoing a colon cleanse gives them a boost of energy, but several studies showed little benefit. However, a person who is constipated without any other medical diagnosis may benefit from a colon cleanse performed by a trained therapist using FDA-approved instruments.