Basically, gallstones are "stones" or pieces of solid material that form in the gallbladder or bile ducts. The 2 main types include the cholesterol stones which are usually yellow-green in color and are approximately 80% of which are cholsterol stones. The next type would be pigment stones, which are smaller and darker and are made up of bilirubin. Although small in size, gallstones can cause big discomfort. They may be "silent stones" but can cause a number of symptoms including pain in the upper abdomen, nausea, vomiting, and other gastrointestinal problems. What can you do to keep your gall bladder healthy? According to research or other evidence, the following self-care steps may be helpful.