No hot water and low pressure
If you live in a hard water area or have galvanized pipes try this:


Turn off the water supply at sink stops
Remove the handle and the nut that holds the cartridge
Pull the cartridge and make sure to not lose the parts
Clean the cartridge
With hand over the valve top, slowly crack open water to flush
Put it all back together
Repeat on the other side


I have found everything from rust, pebbles, pipe thread tape, and sand in valve stems since the orifices are so small they clog easily. I hope that is it. Good luck. ☺