Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mntriers Disease ?
    ### Response:
    Mntriers disease causes the ridges along the inside of the stomach wallcalled rugaeto enlarge, forming giant folds in the stomach lining. The rugae enlarge because of an overgrowth of mucous cells in the stomach wall.
                
In a normal stomach, mucous cells in the rugae release protein-containing mucus.
    