The answer to 'why is my shower frozen' is that a frozen shower is typically caused by a frozen water pipe or showerhead. This can happen when the temperature drops below freezing, causing the water in the pipes or showerhead to freeze and block the flow of water. Common symptoms include no water coming out of the showerhead, and potentially visible ice or frost buildup.
To fix a frozen shower, you'll first need to locate the frozen section of the plumbing and thaw it out. This may involve using a space heater, hair dryer, or other heat source to warm up the affected area. You can also try insulating the pipes to prevent future freezing. If the issue persists or you're unable to locate the frozen section, it's best to call a professional plumber who can properly diagnose and resolve the problem.