Only recently the hot water pressure upstairs has gotten low. This affects the 2 upsatirs bathrooms with sink, tub and showers.
The cold water pressure is fine.
The downstairs is working fine with both hot and cold water pressures, which includes the kitchen and downstairs bathroom.
Do you have any suggestions?

Please advise and thanks.

Remove and clean aerators. If this does not help, remove flex hose at shut off valve and see if pressure is good.

Have u had any plumbing work done recently?

Chuck