Why does the water supply in the hotel bathroom keep ringing?

The toilet tank is leaking or water is flowing through the connected water pipe.

When the seal of the toilet is damaged, water will leak and make a sound. If users upstairs or downstairs use the bathroom to flush, because the sewer pipes are connected, the drainage sound will naturally pass through their own drain pipes, thus making noise.

So, the reason for the continuous sound of water in the bathroom may be that the toilet tank is leaking or water is passing through the China Unicom water pipe.