Loss of consciousness is one of the most common side effects of body modification and can be very dangerous. Ordinarily, a piercer may keep smelling salts to handle a fainter. They may also have some small snack like peanut butter and crackers to prevent fainting by replenishing blood sugar in case a client forgot to eat and drink before a piercing. See also shock.
In responsible suspension (or play piercing or flesh pull), a person should not be suspended unless they are completely lucid. While hanging, if the person faints, they should be lowered quickly (but not necessarily unhooked). Once the person regains consciousness, administering water and sugar in a liquid form will help to raise glucose levels in the blood, and they can decide if they'd like to give it another try.