Some plumbing repairs might wait until you can schedule a plumber at your earliest convenience; if a bathroom sink is stopped up, you might use another sink in the home until you can call a plumber. However, some plumbing problems in the home shouldn't wait until you can make a convenient appointment, but they often mean that you should call an emergency plumber to get to your house as quickly as possible. Note a few of those emergencies here so you know when it's urgent for you to make that call.
Drips or circles in the ceiling
A water leak above your ceiling is not something to ignore or put off fixing, as that circle you see means that building materials have absorbed water from that leak. In turn, they have no doubt become very soft and may likely crumble at any time. If the leak is so large that the ceiling is absorbing water, this can mean that you have a virtual flood in the ceiling. Once the building materials crack and collapse, that water may then spill out and cause even more damage. Don't assume you can just catch a drip in a bucket or ignore a spot in the ceiling, but call an emergency plumber to evaluate the extent of the damage and keep it from getting even worse.
You may not think that a frozen pipe is much of a danger to your home since frozen water doesn't seem like it's going anywhere, but note that water expands when it freezes. Inside a pipe, this frozen water then puts a lot of pressure on the connectors holding two pipes together. A frozen pipe could then easily burst at any time, and your home could be flooded. It's good to have a plumber remove the pipe as soon as possible, before water starts to thaw and then possibly leak out any broken or damaged connectors and cause a flood.
When a toilet overflows, you want a plumber to handle the problem as it's good to ensure that the cause of the blockage is addressed. Most standard clogs in a toilet don't cause it to actually overflow, so when this happens, there might be a leak in the lines that is causing water to fill pipes and, in turn, fill the toilet too full. You then have an overflow, and the problem may repeat every time you use the toilet. Rather than thinking you can address it with a plunger, call an emergency plumber, such as P1 Plumbing & Electrical, instead.