Postoperative ileus: This condition is a common complication after abdominal surgery, including cholecystectomy, where there is a temporary cessation of the normal contractions of the bowel muscles, leading to nausea, vomiting, and weakness due to inadequate nutrition and hydration.

Infection or sepsis: Postoperative infections can cause systemic symptoms such as nausea, weakness, and fever. Early detection and treatment are crucial.
Adhesions or bowel obstruction: These can occur after surgery, leading to nausea, vomiting, and weakness due to bowel obstruction.
Medication side effects: Postoperative medications, especially narcotics and antibiotics, can cause nausea and weakness as side effects.
Dehydration and electrolyte imbalance: Inadequate fluid intake or excessive fluid loss during and after surgery can lead to dehydration and electrolyte imbalances, causing nausea and weakness.

Hemorrhage or bleeding: Internal bleeding after surgery can lead to severe weakness, dizziness, and even shock. It requires immediate medical attention.
Bile duct injury: This is a serious complication of cholecystectomy that can cause severe abdominal pain, nausea, and weakness due to peritonitis or sepsis.
Pancreatitis: Injury to the pancreas during surgery can lead to pancreatitis, causing severe abdominal pain, nausea, and weakness.

Porphyria: A rare genetic disorder that can be triggered by surgery, certain medications, or stress, leading to acute episodes of nausea, weakness, and abdominal pain.
Addisonian crisis: A life-threatening condition caused by acute adrenal insufficiency, which can be triggered by the stress of surgery, leading to severe weakness, nausea, and hypotension.
Dumping syndrome: A condition that can occur after gastric surgery but is rare after cholecystectomy, where food moves too quickly from the stomach to the small intestine, causing nausea, weakness, and diarrhea.