Rheumatoid arthritis is one possible cause of stiffness or pain in the fingers, according to WebMD. Finger stiffness and pain may also be caused by carpal tunnel syndrome or Dupuytrens contracture, according to the MedlinePlus.
There are several possible causes of hand stiffness or pain, and only a doctor can make a definitive diagnosis. In many cases, hand pain is caused by repetitive movements such as typing or writing, explains MedlinePlus. If the pain is accompanied by a frequent numbness or tingling, the cause may be carpal tunnel syndrome. These issues can sometimes be treated by regular finger exercises and taking periodic breaks from typing and writing.