A pattern of gas and bloating may be an indication that a tumor is growing, especially if it worsens or is accompanied by bleeding. While the formation of a tumor may not be enough to cause a total obstruction, the increasing pressure placed on the colon walls can cause distress and even cramping in the upper intestinal tract.
The more general term glucose syrup is often used synonymously with corn syrup, since glucose syrup is in the United States most commonly made from corn starch.
Glucose syrup is a liquid sweetener used in candy, desserts and that ice cream in the picture. It can made from any starch. In the United States, corn is used, but in Europe it is usually derived from wheat. One would assume that the wheat-based glucose contains gluten, but in fact, glucose syrup made from wheat starch is considered gluten-free.