What would cause noise in the toilets pipes?

Water flowing in pipes, loose pipeing, fast acting valves, loose washers in valves.

What kind of noise.

Jim!
Ya got to give us something to work with here. What noise? Describe it for us. When does this noise happen? As you flush? When it fills? After you flush? When the discharge goes down the pipe? Don't make us have to guess your problem. Spit it out in daddys hand! Cheers, Tom