Gallbladder sludge can also lead to biliary colic, pain from a blocked duct that causes the gallbladder to swell. People usually feel this pain under the ribs on the right side. It tends to increase over the first hour, remain constant for up to 12 hours, then slowly recede over a 30 to 90-minute period.
Biliary colic usually resolves on its own, but between 20 and 40 percent of people experience recurrences annually.

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