Intestinal obstruction, as the name implies, is when the contents within the intestines are blocked. Generally, patients are not allowed to eat, but this depends on the progress of the condition and whether there is a need for food or water intake. In some cases of incomplete obstruction, it is possible to consume a small amount of liquid or residue-free diet. However, for cases of obstruction with clear symptoms and severe conditions, patients are not permitted to eat. They might even require gastrointestinal decompression, which involves the insertion of a gastric tube for further treatment.