A small gallbladder is a gallbladder that is smaller than normal. The normal range of gallbladder size is 5-8 cm in length, 3-4 cm in diameter and 40-80 ml in volume. When the gallbladder is smaller than this normal range, it is considered small. When the gallbladder is smaller than this normal range, it is called small gallbladder. Small gallbladder may be caused by genetic factors, checking forward food or gallbladder diseases. 1. Genetic factors: Different patients have different genetic factors, which may lead to different developmental size of the gallbladder among different individuals, which belongs to individual differences at the physiological level, and the gallbladder is small, but it does not affect the function and health of the gallbladder. 2. Eating before examination: The function of gallbladder is to store and concentrate the bile produced by the liver, after eating, the bile is released from the gallbladder to participate in digestion, and the size of the gallbladder will become smaller at this time. Therefore, if you eat before the examination, the bile will be released, and the result of gallbladder examination will be small. 3. Influence of gallbladder diseases: chronic cholecystitis, gallbladder stones or tumors will cause the gallbladder to be stimulated by long-term inflammation, which will thicken the wall of the gallbladder and lead to small gallbladder. It is recommended that patients with small gallbladder should identify the specific cause as soon as possible, and if it is a pathologic factor, corresponding treatment should be carried out under the guidance of the doctor.