Today my right hand started shaking uncontrollably when i started writing with a pencil...what does that mean?

Shaking or cramping?: Can you disclose your age and whether or not anyone in your family suffers from shaking, tremors, muscle spasms, or neurological disorders in general? Did this problem actually start that abruptly as you are making it seem or has it been slowly getting worse over time?

Shaking: need more information....the differential diagnosis includes, tremor, rigors,and focal seizure. You may need to see a doctor to sort this out.