Grey Turner sign is a bluish-purple bruising that appears on the flanks, the area on either side of your abdomen between the ribs and hips. It’s not a disease itself but a visible clue that bleeding is happening deep inside the abdomen. The discoloration shows up because blood from internal hemorrhaging has slowly seeped through layers of tissue until it reaches the skin’s surface.
What It Looks Like
The bruising typically appears as a patch of bluish to purplish discoloration along one or both flanks. It looks similar to a deep bruise you might get from an injury, but there’s no history of trauma to the area. The color can shift over time, progressing through the same yellowish-green stages any bruise goes through as the body breaks down the pooled blood beneath the skin.
Grey Turner sign doesn’t appear immediately when internal bleeding begins. Because the blood has to travel from deep within the abdomen through multiple layers of connective tissue and muscle before reaching the skin, there’s a delay. This means the sign often shows up days after the underlying problem has already started, making it a late indicator rather than an early warning.
How Internal Bleeding Reaches the Skin
The bleeding that causes Grey Turner sign originates in the retroperitoneum, the space behind the abdominal cavity where organs like the pancreas, kidneys, and major blood vessels sit. When hemorrhaging occurs in this area, blood doesn’t stay contained. It dissects through fascial planes, which are the thin sheets of connective tissue that separate muscles and organs from one another. Think of it like water finding the path of least resistance through layers of fabric. Eventually, the blood works its way outward to the subcutaneous tissue just beneath the skin, where it becomes visible as discoloration on the flanks.
Conditions That Cause It
Grey Turner sign is most classically associated with acute hemorrhagic pancreatitis, a severe form of pancreas inflammation where the organ essentially begins to digest itself, damaging blood vessels and causing internal bleeding. However, it appears in fewer than 1% of people with acute pancreatitis overall, and somewhere between 3% and 5% of those with more severe cases.
Pancreatitis isn’t the only cause. The same flank bruising can appear with:
- Ruptured aortic aneurysm: a tear in the body’s largest artery, which runs through the retroperitoneum
- Ruptured ectopic pregnancy: when a fertilized egg implants outside the uterus and causes significant hemorrhaging
- Liver tumors: both primary liver cancers and cancers that have spread to the liver can bleed into surrounding tissues
Any condition that produces enough bleeding in the retroperitoneal space can theoretically produce Grey Turner sign. The common thread is significant hemorrhage in an area where blood can migrate outward toward the flanks.
Grey Turner Sign vs. Cullen Sign
These two signs are often mentioned together because they share the same underlying mechanism. Both result from retroperitoneal hemorrhage seeping through tissue layers to the skin. The difference is location. Grey Turner sign appears on the flanks, while Cullen sign appears as bruising around the belly button. A patient can have one or both, depending on the direction the blood travels through the fascial planes. Both are considered signs of the same type of abdominal wall hemorrhage, specifically bleeding beneath the fascia of the abdominal wall muscles. When either one appears, it signals the same clinical concern: significant internal bleeding that has been ongoing long enough for blood to reach the surface.
Why It’s a Serious Finding
The presence of Grey Turner sign in acute pancreatitis is associated with markedly higher mortality. A retrospective study of 519 pancreatitis patients found that those who developed these skin signs had a mortality rate between 50% and 60%. A later prospective study of 770 patients reported a somewhat lower but still alarming mortality rate of 37%. The sign is also linked to a higher risk of developing pseudocysts, fluid-filled sacs that can form near the pancreas as a complication.
The reason the prognosis is so poor isn’t that the bruising itself causes harm. It’s what the bruising represents. By the time enough blood has migrated from deep in the abdomen all the way to the skin surface, the patient has experienced substantial internal hemorrhage. The sign effectively confirms that a severe, potentially life-threatening process has been underway for some time. It’s a marker of disease severity rather than a cause of danger on its own.
What Happens When It’s Found
Because Grey Turner sign is a late finding, most patients who develop it are already hospitalized or seeking emergency care for symptoms of the underlying condition, such as severe abdominal pain, low blood pressure, or signs of shock. The appearance of flank bruising in this context confirms that significant retroperitoneal bleeding has occurred and typically prompts urgent imaging to identify the source and extent of the hemorrhage. Treatment focuses entirely on the underlying cause, whether that’s managing severe pancreatitis, repairing a ruptured aneurysm, or addressing another source of bleeding. The bruising itself resolves on its own as the body reabsorbs the pooled blood, just as any bruise would, once the source of bleeding is controlled.