Bile Duct Injury or Leak: This is a common complication following cholecystectomy, especially if the surgery was complex or if there were anatomical variations. The presentation of right upper abdominal pain after such a procedure should prompt an investigation into possible bile duct injuries.

Residual or Recurrent Gallstones: Even after cholecystectomy, it's possible for gallstones to remain in the bile ducts, causing pain.
Adhesions or Scar Tissue: Post-surgical adhesions can cause bowel obstruction or pain, which might be perceived in the right upper abdomen.
Hepatitis or Liver Injury: Direct injury to the liver during surgery or post-operative hepatitis could cause right upper quadrant pain.
Pancreatitis: Inflammation of the pancreas, which could be related to the surgery or other causes, presenting with abdominal pain.

Hemorrhage: Internal bleeding post-surgery is a life-threatening condition that requires immediate attention.
Perforation of the Gastrointestinal Tract: A hole in the stomach, small intestine, or other parts of the GI tract can lead to severe infection and death if not promptly treated.
Bile Peritonitis: Leakage of bile into the abdominal cavity can cause severe inflammation and infection, which is life-threatening.

Hernias: Although less common, hernias can occur at the site of surgical incisions (incisional hernias) and cause abdominal pain.
Intestinal Obstruction: A blockage in the intestine that can be due to various causes, including adhesions from the surgery.
Liver Abscess: A rare complication that could arise from bacterial infection of the liver, potentially related to the surgery or biliary tract issues.
Portal Vein Thrombosis: A blood clot in the portal vein, which is a rare but serious condition that could cause abdominal pain among other symptoms.