A sudden or gradual drop in shower water pressure can be triggered by several common plumbing issues. The most frequent culprit is heavy mineral scale (calcium and lime) accumulation clogging the tiny spray nozzles on the showerhead faceplate. Other causes include a partially closed hot or cold supply valve behind the wall, a clogged anti-scald pressure-balancing cartridge inside the shower mixing valve, or a malfunctioning water heater restricting flow. Verification: Unscrew the showerhead and inspect the internal screen for trapped sediment to isolate the restriction.
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