Recently, I always hear the sound of dripping from the ceiling of the toilet. What is the reason?

Maybe it's the sound of an expansion joint under the sewer tee. The expansion joint is used to offset the expansion of the drainage pipe due to thermal expansion and cold contraction, and there is a rubber ring inside to seal it.

Sounds are easier to hear in winter, because hot water often flows out of the drain pipe of bathtub and washbasin in winter, and there is a temperature difference of 40 degrees between hot water and cold water pipes. The sharp temperature difference makes the pipeline expand and contract sharply, and the wall of the drainage pipe rubs the rubber ring of the expansion joint to make a sound. In summer, the temperature difference between the hot water flowing down and the pipeline is relatively small, so it is not easy to hear this sound.

Solution: Unscrew the green color of the expansion joint (a cover on the expansion joint), pull out the rubber ring for adjustment, then reinstall and tighten the green color.

Extended data:

Other factors:

1, there may be auditory hallucinations. Auditory hallucination is a kind of distorted or strange hearing, and there is no corresponding external sound stimulus acting on the auditory organs. I always hear the dripping sound on the ceiling of the toilet, which may be the feeling of auditory hallucination. Patients sometimes hear someone calling for help, but this sound does not exist in the real external sound field.

2. If the exposed water supply pipe is a horizontal iron pipe, it may be condensed water caused by hot weather. If not, it should be that the waterproof layer upstairs leaks or the outer wall leaks rain.