The sink in an upstairs bath has experienced a sudden lack of water pressure. Both hot and cold water. The shower in the bath has no problems with pressure. I suspect its fixture related, but...

I have not been able to find any evidence of a leak under the sink, nor along the pipe path.

The sink in an upstairs bath has experienced a sudden lack of water pressure. Both hot and cold water. The shower in the bath has no problems with pressure. I suspect its fixture related, but...

I have not been able to find any evidence of a leak under the sink, nor along the pipe path.
Wes
The first thing to check is the screen in the faucet.
At the end of the faucet you should be able to unscrew the fitting that holds the screen in place.
With this fitting off, the water should flow freely if that is the problem.
Then clean the screen and put it back together.