The answer to 'why is my shower clogged' is that there are several common causes, including hair, soap scum, and other debris buildup in the shower drain. Symptoms of a clogged shower drain include slow drainage, standing water, or a foul odor coming from the drain.
In many cases, you can try to unclog the shower drain yourself using a drain snake or plunger. However, if the clog is severe or you're unable to clear it, it's best to call a professional plumber. They have the right tools and expertise to safely and effectively clear the clog without causing further damage to your plumbing system.