We live in a house, we have 2 toilets 1 upstairs and 1 downstairs. The downstairs one started bubbling vigorously and the water level in the bowl started rising. Now flushing just increases the water level and the level goes down very slowly but does not reach the normal level.
The upstairs toilet is absolutely fine. Tried plunging it but doesn't seems to be working, any idea what could be wrong and how to fix it?
More details on this issue:
No basement, or a downstairs shower. The downstairs toilet is the lowest thing connected to a drain. The bubbling was spontaneous and the water level rose itself prior to the flushing.
When the upstairs toilet is flushed the bottom toilet's water level goes down then back up again. Is this something I should be scared of? Also not sure if it is helpful but there has been a small storm where it has been continuously raining since yesterday.
An update on the issue, as the user MonkeyZeus suggested the issue seems to have been fixed on its own. Checked the water level in the toilet and it was way below the normal level, so I half flushed it to check and the water has returned to the normal level and is working fine. So most likely the issue was with the main sewer line which has been fixed on its own.