Gallstones 13mm refers to stones of 13mm in size. These stones usually do not cause particularly serious problems, and most patients do not have obvious symptoms. However, some patients may develop acute cholecystitis after eating greasy food, overeating, or drinking alcohol. In addition, in a very small number of patients, gallbladder stones may fall from the gallbladder into the bile duct after overeating, causing common bile duct stones. Common bile duct stones can cause acute pancreatitis and acute cholangitis, which are more serious complications, but most patients do not have obvious symptoms. In daily life, you need to pay attention to a light and regular diet, avoid greasy food, overeating and heavy drinking, thus avoiding causing gallbladder contraction. Otherwise, it may encourage the movement of stones from the gallbladder to the bile ducts, causing serious conditions. Therefore, if the size of the gallstones is only 13mm, you need to pay attention to the life aspect and review the ultrasound regularly, which can generally control the condition better.