Trash in the hot side of the stop vale,supply riser, body of the faucet, faucet cartridge or a combination of all the above.
Start at the hot side stop valve for the kitchen faucet. Remove supply line and run water into a bucket.
If you get water out of the valve that means the faucet or supply riser is stopped up.
Direct the hot water supply tube into the bucket and turn on the cold side.......this will backwash the cartridge and possibly blow the trash into the bucket.
Try all that before you tear the faucet apart..