Some embodiments described herein generally relate to apparatus and methods for treating diverticula. The diverticula may be present within a wall of a gastrointestinal organ, such as a colon, of a human or animal. In some examples, the apparatus may include a flexible conduit having a proximal end, a distal end, and a passageway therethrough, a balloon-forming chamber at the distal end of the flexible conduit, and at least one heating element positioned on an interior of the balloon-forming chamber. The apparatus may further include an endoscope in which the flexible conduit may be positioned such that the balloon-forming chamber extends from an end of the endoscope.