Gastroesophageal Reflux Disease (GERD): This condition is common in pediatric patients and can cause biliary emesis due to the reflux of bile into the stomach and subsequently into the esophagus.

Viral Gastroenteritis: Infections such as rotavirus or norovirus can lead to biliary emesis in children due to inflammation and irritation of the gastrointestinal tract.
Intussusception: Although more commonly associated with intestinal obstruction, intussusception can cause vomiting that may be bile-tinged, especially if there is associated intestinal ischemia.
Pyloric Stenosis: This condition, characterized by the narrowing of the pylorus, can lead to projectile vomiting that may occasionally be bile-stained, particularly if the condition is advanced or if there is associated gastroesophageal reflux.

Appendicitis: While appendicitis typically presents with abdominal pain, nausea, and vomiting, the vomit can occasionally be bile-tinged. Missing this diagnosis can lead to severe consequences, including perforation and peritonitis.
Intestinal Obstruction: Any cause of intestinal obstruction, such as volvulus, adhesions, or hernias, can lead to biliary emesis. Early diagnosis is crucial to prevent complications like ischemia and necrosis of the bowel.
Pancreatitis: Acute pancreatitis can cause severe abdominal pain and vomiting, which may be bile-tinged. It requires prompt recognition and treatment to manage pain and prevent complications.

Biliary Atresia: A rare condition in infants where the bile ducts are absent or blocked, leading to jaundice and potentially bile-stained vomiting.
Choledochal Cysts: Congenital anomalies of the bile duct that can cause obstructive jaundice and, in some cases, biliary emesis.
Congenital Hypertrophic Pyloric Stenosis with Associated Anomalies: Although pyloric stenosis is more common, when associated with other congenital anomalies, it can present with a complex clinical picture that includes biliary emesis.