Water from the sink, tub or toilet is not flowing. You may have caused this condition to be due to bad user habits. Keep in mind, as water is important to us, be grateful that simply turning the tap will give you the drinking water you need and learn how to see the link between getting rid of the waste by the water pipe on the other side.
To solve a minor blockade yourself
With an acute small problem, it is often enough to use a good old bell. Another solution, where the vacuum force was not sufficient, is the use of one of the chemical products available in drug stores. Again, however, we are thinking of ecological impacts and trying to reach such ways as little as possible. More skilled individuals can try to clean the pipes using a hand pen, if even it does not work, it is time to turn to a professional company to clean drains.