Adhesions or Internal Hernia: After gallbladder removal, adhesions can form, leading to bowel obstruction or internal hernias, which can cause umbilical pain due to the involvement of the bowel or its mesentery.

Incisional Hernia: A common complication after abdominal surgery, including cholecystectomy, where a hernia forms through the incision site, potentially causing pain, especially if it becomes incarcerated or strangulated.
Bowel Obstruction: Partial or complete blockage of the intestine, which can occur due to adhesions, hernias, or other causes, leading to severe abdominal pain, including around the umbilicus.
Intra-abdominal Abscess: A collection of pus that can form after surgery, causing pain, fever, and other systemic symptoms.

Appendicitis: Although less common in this context, appendicitis can present with atypical pain, including around the umbilicus, and is a surgical emergency if not promptly treated.
Mesenteric Ischemia: A condition where the blood flow to the intestines is compromised, leading to severe abdominal pain, which can be diffuse or localized, including around the umbilicus.
Perforated Viscus: A hole in one of the abdominal organs, such as the stomach or intestine, leading to peritonitis, which is a life-threatening condition requiring immediate surgical intervention.

Carcinoid Tumor: A rare type of tumor that can cause abdominal pain, including around the umbilicus, due to its potential to cause bowel obstruction or other complications.
Intussusception: A condition where a part of the intestine slides into an adjacent part, potentially causing bowel obstruction and severe abdominal pain.
Abdominal Wall Endometriosis: A rare condition where endometrial tissue grows in the abdominal wall, potentially causing cyclical pain, including around surgical scars or the umbilicus in women.