Gallbladder diseases refer to various conditions that affect the gallbladder, a small organ located beneath the liver. The most common issues include gallstones, which are hardened deposits that can block the flow of bile, leading to pain and digestive problems. Symptoms may include sudden pain in the upper abdomen, nausea, and vomiting. Another common condition is cholecystitis, which is the inflammation of the gallbladder, often caused by gallstones. This can result in severe abdominal pain and fever. Treatment options vary from dietary changes to surgical procedures, such as cholecystectomy, the removal of the gallbladder, depending on the severity of the disease.