The answer to 'my drain smells bad' is that a foul odor coming from your drain is usually caused by a buildup of organic matter, mold, or bacteria. Common symptoms include a persistent unpleasant smell, slow draining, and even visible gunk or debris in the drain. The good news is there are several DIY solutions you can try before calling a professional plumber.
First, try using a drain cleaner or baking soda and vinegar to break down the blockage and flush out the odor-causing material. If that doesn't work, you may need to use a plunger or auger to physically dislodge the clog. However, if the smell persists or the drain is severely clogged, it's best to call in a professional plumber who can properly diagnose and fix the issue.