What is a primary indication of gallstones in a patient?

The primary indication of gallstones in a patient is abdominal pain. This type of pain is often described as a sudden and intense discomfort in the upper right abdomen, which may also radiate to the back or right shoulder. It commonly occurs after eating a fatty meal due to the gallbladder's inability to effectively process the fats, leading to the characteristic gallbladder attack or biliary colic.

While symptoms like nausea and vomiting can accompany gallstone episodes, especially during acute attacks, abdominal pain is usually the most prominent and distinguishing symptom that prompts individuals to seek medical attention. Conversely, increased urination and high fever are not typical indicators of gallstones, which is why they do not serve as primary indications for this condition.