Gall Bladder Stones 

In medicine, gallstones are crystalline bodies formed within the body by accretion or concretion of normal or abnormal bile component.

Gallstones can occur anywhere within the biliary tree, including the gallbladder and the common bile duct. A gallstone size varies and may be as small as a sand grain or as large as a golfball. The gallbladder may develop a single, often large stone or many smaller ones. They may occur in any part of the billary system. Gallstones have different appearance, depending on their contents.

Gallstones usually remain asymptomatic initially. They start developing symptoms once the stones reach a certain size. A main symptom of gallstones is commonly referred to as a gallstone "attack", also known as biliary colic, in which a person will experience intense pain in the upper abdominal region that steadily increases for approximately thirty minutes to several hours. A patient may also encounter pain in the back, ordinarily between the shoulder blades, or pain under the right shoulder. In some cases. the pain develops in the lower region of the abdomen, nearer to the pelvis, but this is less common. Nausea and vomiting may occur.