A sudden drop in hot water pressure may be due to an issue with your water heater that should be promptly addressed by a professional. Alternatively, limescale buildup on your showerhead or faucets can also cause water to trickle out slowly. Other causes include clogs, corroded pipes and sediment buildup.

Some of the most common causes for a smelly shower drain range from problems that can be solved with a DIY fix or more regular maintenance — like a dry P-trap, a clogged drain or biofilm buildup — to issues that require the help of a pro — like ventilation issues or a sewer gas leak.