Causes

As explained, gallstones are formed due to the accumulation of the bile deposits in the gallbladder – excess cholesterol or excess bilirubin in the bile. Though these are the two main reasons, there are other substances that could increase the tendency to form gallstones. The excess bilirubin pigment in the blood results from history of liver and blood diseases. If the gallbladder does not empty completely, it could result in deposition of solids which form stones – this could be due to poor muscle tone.