My hands sometimes shake when i'm doing something. today my arm and hand shaked so bad i couldn't do the task i was doing. what may it be?

Tremor: in a young person often obviates a work up. Medications including OTC agents, stimulants (caffeine) and thyroid status should be reviewed. Sometimes anxiety or fear can contribute to a tremor (think shaking like a leaf) If the cause is not obvious then see a neurologist to expand the work up. Usually the cause and treatment are not immediately obvious. www.healthtap.com/drercweisman RVFXFG

Intention tremor: may be self limited or due to weakness from disuse.