The answer to 'my shower smells bad' is that a bad smell in the shower is often caused by a buildup of soap scum, mildew, or bacteria. This can happen due to poor ventilation, infrequent cleaning, or a clogged drain. The symptoms include a foul odor coming from the shower drain or walls.
To fix a smelly shower, you can try cleaning the drain and shower walls with a mixture of baking soda and vinegar, or using a commercial shower cleaner. Make sure to scrub thoroughly and rinse well. If the smell persists, it may be necessary to call a professional plumber to inspect the pipes and drains for any deeper issues.