Why is the kitchen drain overflowing, the bathroom drain not overflowing

The sewer pipe overflowed because the leftovers were blocked, and the bathroom was not blocked because there were no such things. There are few substances that cause blockage, and there is a possibility of blockage over a long period of time.

Explain that your kitchen drain pipe is blocked. The main pipe is not blocked.

The kitchen drain grease is large, easy to block the drain pipe, boil a pot of boiling water and pour it in, can melt the grease, and can have a sterilization effect.