Grey Turner's sign refers to bruising of the flanks, the part of the body between the last rib and the top of the hip.

The bruising appears as a blue discoloration,[1] and is a sign of retroperitoneal hemorrhage, or bleeding behind the peritoneum, which is a lining of the abdominal cavity.

Grey Turner's sign takes 24–48 hours to develop, and can predict a severe attack of acute pancreatitis.

Both signs may be indicative of pancreatic necrosis with retroperitoneal or intra-abdominal bleeding.

[3] Causes include It is named after British surgeon George Grey Turner.