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This could be a blockage in the main DWV (drain, waste, vent) pipe which is usually a 4" pipe from the upstairs toilet and passing by the downstairs toilet, presuming the one is directly above the other. The other drains (sinks, showers, etc.), are smaller (1 1/2" or 2") and might be tied in below the blockage in the main stack and are therefore not affected. In this case, you could remove a toilet and run a plumber's snake or drain auger down the main stack to remove the blockage.
This blockage, however, could also be in the drain going to the street, since these are often blocked by tree roots growing through the tiles or pipes. The smaller drains are not affected because of the small amount of water which seeps through the blockage, whereas the large rush of water from a toilet, will back up easily. To correct this problem, you will need a power auger designed to cut through roots and this auger can be run through the main cleanout towards the street. These are available at rental shops.
Otherwise, hire a plumber :)
What else can I help you with?
Hwy when you flush your upstairs toilet does your downstairs shower drain erupt sewage?
The drain from the toilet to the main drain is plugged and the branch to the shower is not. If the main floor toilet flushes, it is between the two toilets and not between the house and the sewer.
Do Japanese toilets flush clockwise or anticlockwise?
anticlockwise. (All toilets in the Northern Hemisphere flush clockwise, all toilets in Southern Hemisphere flush anticlockwise.)
Can you flush the upstairs toilet when you have the downstairs toilet off and capped off?
If your plumbing system is properly installed there should not be any problem. If it isn't installed properly, you would already have water from sinks and bathtubs backing up out of the downstairs toilet.
What could be wrong if there is a loud swooshing sound in the pipes every time you flush the two upstairs toilets and it just started a week ago?
pressure regulator valve
What is the difference between normal and low flush toilets?
low flush toilets use less water.
Do dual flush toilets work in basement toilets?
Yes
Did vikings hae toilets that flush?
No
What are the different kinds of latrine?
pit toilets, composting toilets, pour-flush latrine, cistern-flush toilet, bucket latrine
What are the benefits of a top button flush toilet compared to traditional flush toilets?
Top button flush toilets offer a more efficient and powerful flush compared to traditional flush toilets. This can result in better waste removal and less water usage, leading to potential cost savings and environmental benefits.
Every time you flush the toilet how many liters are used?
It depends on what type of flush you use. Old style single flush toilets use around 11 litres of water per flush, older dual flush toilets use 4.5 or 9 litres per flush, while modern water efficient dual flush toilets use 3 or 6 litres per flush.
What are the different types of toilet flush systems available?
The main types of toilet flush systems are gravity-fed, pressure-assisted, and dual-flush. Gravity-fed toilets use the weight of water to flush waste, pressure-assisted toilets use compressed air to force water out with more power, and dual-flush toilets have two flush options for liquid and solid waste.
Do Roman toilets flush automatically?
Yes, but not in the way we think of flushing toilets. In private houses, a bucket or two of water was used to flush away the waste and prevent odor. In the public toilets latrines, there was a stream of running water beneath the seats to flush away waste.
