A “bad” gallbladder can look different depending on whether you’re talking about what shows up on imaging or what you notice on your own body. On an ultrasound, a diseased gallbladder typically appears swollen, with walls thicker than 3.5 millimeters and visible stones or sludge floating inside. On the outside, gallbladder problems can cause yellowing of your skin and eyes, unusually pale stools, and dark urine. Here’s what to look for in both cases.
What a Healthy Gallbladder Looks Like
A normal gallbladder is a small, pear-shaped sac that sits just beneath the liver. On ultrasound, it measures roughly 3 centimeters wide by 10 centimeters long, with thin, smooth walls and a dark, fluid-filled interior. The bile inside appears uniformly dark on the screen because it’s a simple liquid with nothing floating in it. When the gallbladder contracts after a meal to release bile, it should empty at least 30% to 35% of its contents. That’s the baseline for “working correctly.”
What Gallstones and Sludge Look Like
The most common sign of a bad gallbladder is the presence of gallstones. These show up on ultrasound as bright white spots that cast a dark shadow behind them, almost like a flashlight beam being blocked by a rock. Stones can range from the size of a grain of sand to a golf ball.
If a stone is removed during surgery, its appearance depends on its type. Cholesterol gallstones, the most common variety, are usually yellowish-green and can feel waxy or hard. They form when the liver produces more cholesterol than bile can dissolve, and the excess gradually crystallizes. Pigment gallstones are dark brown or black and tend to be smaller. These develop when your body produces too much bilirubin, the chemical left over from breaking down red blood cells.
Before full stones form, you may develop biliary sludge. On ultrasound, sludge looks like a layer of grayish, grainy material that settles at the bottom of the gallbladder, similar to sediment at the bottom of a glass. Unlike stones, sludge doesn’t cast a shadow. It’s made up of tiny cholesterol or calcium crystals (as small as half a millimeter) mixed with mucus and bile. One telltale sign: sludge moves slowly when you change position during the scan, while stones shift more quickly.
Signs of an Inflamed Gallbladder Wall
When the gallbladder becomes inflamed, a condition called cholecystitis, it changes shape on imaging in several ways. The wall thickens beyond the normal 3 millimeters, sometimes doubling or tripling in size. Research published in the American Journal of Roentgenology found that wall thickness greater than 3.5 millimeters is highly accurate in predicting gallbladder disease, though a thinner wall doesn’t completely rule it out.
An inflamed gallbladder also tends to look distended, stretching well beyond its usual 10-centimeter length. Fluid may collect around the outside of the gallbladder, appearing as a dark halo on ultrasound. In chronic cases where the gallbladder has been inflamed repeatedly over months or years, the wall can appear shrunken and scarred instead of swollen, because scar tissue has replaced the normal muscle.
What a Porcelain Gallbladder Looks Like
In rare cases, calcium deposits build up inside the gallbladder wall itself, creating what’s called a porcelain gallbladder. This is one of the most visually distinctive forms of gallbladder disease. On a standard X-ray or CT scan, the gallbladder wall appears as a bright white outline, almost like a shell or eggshell, because calcium shows up vividly on these images.
There are two patterns. In the more extensive form, a continuous band of calcium replaces the entire muscular layer of the gallbladder wall, showing up as large plaque-like areas on imaging. In the less extensive form, small flecks of calcium scatter through the lining in a granular, speckled pattern. Either version typically means the gallbladder has been chronically diseased for a long time and is no longer functioning.
How a Poorly Functioning Gallbladder Shows Up
Sometimes a gallbladder looks relatively normal on ultrasound but doesn’t work properly. This is where a HIDA scan comes in. During this test, a radioactive tracer is injected into your bloodstream and tracked as it moves through your liver, into your bile ducts, and into your gallbladder. A healthy gallbladder lights up on the scan as it fills with the tracer, then empties when stimulated.
A bad gallbladder on a HIDA scan either doesn’t fill at all (suggesting the duct is blocked) or fills but barely empties. Cleveland Clinic considers an ejection fraction below 30% to 35% abnormal. If your gallbladder only squeezes out 10% or 15% of its contents, that sluggish performance points to chronic inflammation even when stones aren’t present. The scan essentially catches a gallbladder that looks fine structurally but has quietly lost its ability to do its job.
What You See on Your Own Body
Gallbladder problems can also change how you look on the outside, particularly when a stone blocks the bile duct and prevents bile from reaching your intestines.
The most recognizable sign is jaundice, a yellowing of the skin and the whites of your eyes. This happens because bilirubin, which bile normally carries out of your body, backs up into your bloodstream instead. The yellowing tends to appear first in the eyes before becoming noticeable on the skin. It’s worth noting that eating large amounts of carrots, squash, or other foods rich in beta-carotene can also give your skin a yellowish tint, but in that case your eyes stay white. If both your skin and eyes are yellow, that’s a different situation entirely.
Your stool and urine change too. Bile is what gives stool its normal brown color, so when bile can’t flow properly, your stool turns pale, clay-colored, white, or gray. At the same time, the excess bilirubin in your blood gets filtered through your kidneys, making your urine noticeably darker than usual, sometimes tea or cola-colored. The combination of jaundice, pale stool, and dark urine together is a strong signal that something is blocking bile flow, whether from a gallstone lodged in the duct, inflammation, or another obstruction.
Some people also notice tenderness or swelling in the upper right side of the abdomen, just below the rib cage, where the gallbladder sits. During a particularly bad episode of inflammation, the area can feel firm and painful to the touch, and taking a deep breath while someone presses on that spot typically sharpens the pain.