What are some possible complications after pyloric stenosis?

Very few: Vomiting is common after surgery for pyloric stenosis if fed too fast or too much volume. It always takes the stomach a week or two to adjust to surgery.

Usually few, if any: Pyloric stenosis surgery very seldom has complications. Generic complications can occur, such as wound infection or minor scarring. The key problem to recognize and fix during the operation is perforation of the duodenal mucosa. One cuts thru the thickened pyloric muscle fibers to open up the outlet of the stomach, but if one cuts all the way into the lumen, it must be recognized and repaired.

Usually none: The only problem encountered is swallowing foreign body such as marble or coin. When have surgery for pyloric stensis the relative narrowing of pyloric channel persists for years. Liquids have no problem passing from stomach into duodenum. Large hard objects can hang up in stomach indefinitely. Very rarely pyloric stenosis can recur.