What could cause noise from shower drain?

Noise from a shower drain can be caused by several factors, including air trapped in the Plumbing, which creates a gurgling sound as water flows. Additionally, clogs or buildup in the drain line can lead to water backing up and making noise as it forces its way through. Loose or improperly fitted pipes may also vibrate and create rattling sounds when water flows through them. Finally, changes in water pressure can lead to banging noises known as "water hammer."