Band slippage is one possible risk involved in Lap-Band surgery. According to Allergen, the makers of the Lap-Band system, approximately 24 percent of Lap-Band patients will experience band slippage at some point. Slippage occurs when the band slides further down the stomach, causing the upper pouch to become bigger and the band to become tighter. Though some patients who experience slippage may not notice any symptoms, for others, slippage can be a painful and dangerous condition. Learning the risk factors for slippage and familiarizing yourself with its symptoms can help you avoid and identify this condition.