Warning signs of gallstones may include: abdominal pain, especially after eating, nausea, vomiting, indigestion, heartburn, bloating, and gas. In some cases, fever and chills may also be present. Pain may be felt in the right side of the abdomen, in the back, or between the shoulder blades. If an infection is present, jaundice may be present. Seek medical attention if any of these symptoms are present.