When i make a fist and clench really hard, when i release all of my fingers cramp and its hard to extend them back out, but when i do the cramps gone.?

Trigger finger or: Muscle spasm and cramping, either one is possible. If you also have swollen or slightly stiff joints the increased force in the joint when you make a fist may also make the fluid in the joint space redistribute and it may interfere with terminal extension , you ar ein effect making your joint stiff. All these things may be happening at the same time.