Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Gallstones ?
    ### Response:
    Many people with gallstones do not have symptoms. Gallstones that do not cause symptoms are called asymptomatic, or silent, gallstones. Silent gallstones do not interfere with the function of the gallbladder, liver, or pancreas.
                
If gallstones block the bile ducts, pressure increases in the gallbladder, causing a gallbladder attack.
    