The answer to 'why is my pipe frozen' is that pipes freeze when the temperature drops below freezing. This causes the water inside the pipe to freeze, which can lead to a pipe bursting and water damage. Common causes include lack of insulation, drafts, and exposure to the elements.
Some common symptoms of a frozen pipe include no water coming out of the faucet, frost on the pipe, and the pipe feeling cold to the touch. If you suspect a pipe is frozen, act quickly to thaw it before it bursts. You can try using a space heater, heat lamp, or hair dryer to warm the pipe. If the pipe is inaccessible or the freeze is severe, it's best to call a professional plumber to safely thaw the pipe and prevent further damage.