What are complications from nissen fundoplication?

Depends: Hopefullly none but unfortunately, like after any proceedure complications can occur. The most common problem is difficulty swallowing certain foods. Occasionally it is more difficult to vomit but that is rare.

Operative ...: Complications include generic things such as infection and, if done laparoscopically, intra-abdominal visceral trocar injury and possible conversion to open procedure. Specific to the nissen fundoplication itself are too tight of a fundoplication, unwrapping of the fundoplication, and gastric bloating from difficulty burping or vomiting afterward.